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</pre><pre class="rust ">
<span class="comment">// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
<span class="comment">// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>

<span class="comment">// Rust JSON serialization library</span>
<span class="comment">// Copyright (c) 2011 Google Inc.</span>

<span class="doccomment">//! JSON parsing and serialization</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # What is JSON?</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! JSON (JavaScript Object Notation) is a way to write data in Javascript.</span>
<span class="doccomment">//! Like XML, it allows encoding structured data in a text format that can be</span>
<span class="doccomment">//! easily read by humans. Its simple syntax and native compatibility with</span>
<span class="doccomment">//! JavaScript have made it a widely used format.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Data types that can be encoded are JavaScript types (see the `Json` enum</span>
<span class="doccomment">//! for more details):</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! * `I64`: equivalent to rust&#39;s `i64`</span>
<span class="doccomment">//! * `U64`: equivalent to rust&#39;s `u64`</span>
<span class="doccomment">//! * `F64`: equivalent to rust&#39;s `f64`</span>
<span class="doccomment">//! * `Boolean`: equivalent to rust&#39;s `bool`</span>
<span class="doccomment">//! * `String`: equivalent to rust&#39;s `String`</span>
<span class="doccomment">//! * `Array`: equivalent to rust&#39;s `Vec&lt;T&gt;`, but also allowing objects of</span>
<span class="doccomment">//!   different types in the</span>
<span class="doccomment">//!   same array</span>
<span class="doccomment">//! * `Object`: equivalent to rust&#39;s `BTreeMap&lt;String, json::Json&gt;`</span>
<span class="doccomment">//! * `Null`</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! An object is a series of string keys mapping to values, in `&quot;key&quot;: value`</span>
<span class="doccomment">//! format.  Arrays are enclosed in square brackets ([ ... ]) and objects in</span>
<span class="doccomment">//! curly brackets ({ ... }).  A simple JSON document encoding a person,</span>
<span class="doccomment">//! their age, address and phone numbers could look like</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```ignore</span>
<span class="doccomment">//! {</span>
<span class="doccomment">//!     &quot;FirstName&quot;: &quot;John&quot;,</span>
<span class="doccomment">//!     &quot;LastName&quot;: &quot;Doe&quot;,</span>
<span class="doccomment">//!     &quot;Age&quot;: 43,</span>
<span class="doccomment">//!     &quot;Address&quot;: {</span>
<span class="doccomment">//!         &quot;Street&quot;: &quot;Downing Street 10&quot;,</span>
<span class="doccomment">//!         &quot;City&quot;: &quot;London&quot;,</span>
<span class="doccomment">//!         &quot;Country&quot;: &quot;Great Britain&quot;</span>
<span class="doccomment">//!     },</span>
<span class="doccomment">//!     &quot;PhoneNumbers&quot;: [</span>
<span class="doccomment">//!         &quot;+44 1234567&quot;,</span>
<span class="doccomment">//!         &quot;+44 2345678&quot;</span>
<span class="doccomment">//!     ]</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Rust Type-based Encoding and Decoding</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Rust provides a mechanism for low boilerplate encoding &amp; decoding of values</span>
<span class="doccomment">//! to and from JSON via the serialization API.  To be able to encode a piece</span>
<span class="doccomment">//! of data, it must implement the `rustc_serialize::Encodable` trait.  To be</span>
<span class="doccomment">//! able to decode a piece of data, it must implement the</span>
<span class="doccomment">//! `rustc_serialize::Decodable` trait.  The Rust compiler provides an</span>
<span class="doccomment">//! annotation to automatically generate the code for these traits:</span>
<span class="doccomment">//! `#[derive(RustcDecodable, RustcEncodable)]`</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The JSON API provides an enum `json::Json` and a trait `ToJson` to encode</span>
<span class="doccomment">//! objects.  The `ToJson` trait provides a `to_json` method to convert an</span>
<span class="doccomment">//! object into a `json::Json` value.  A `json::Json` value can be encoded as a</span>
<span class="doccomment">//! string or buffer using the functions described above.  You can also use the</span>
<span class="doccomment">//! `json::Encoder` object, which implements the `Encoder` trait.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! When using `ToJson`, the `Encodable` trait implementation is not</span>
<span class="doccomment">//! mandatory.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Examples of use</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Using Autoserialization</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Create a struct called `TestStruct` and serialize and deserialize it to and</span>
<span class="doccomment">//! from JSON using the serialization API, using the derived serialization code.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! extern crate rustc_serialize;</span>
<span class="doccomment">//! use rustc_serialize::json;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // Automatically generate `RustcDecodable` and `RustcEncodable` trait</span>
<span class="doccomment">//! // implementations</span>
<span class="doccomment">//! #[derive(RustcDecodable, RustcEncodable)]</span>
<span class="doccomment">//! pub struct TestStruct  {</span>
<span class="doccomment">//!     data_int: u8,</span>
<span class="doccomment">//!     data_str: String,</span>
<span class="doccomment">//!     data_vector: Vec&lt;u8&gt;,</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn main() {</span>
<span class="doccomment">//!     let object = TestStruct {</span>
<span class="doccomment">//!         data_int: 1,</span>
<span class="doccomment">//!         data_str: &quot;homura&quot;.to_string(),</span>
<span class="doccomment">//!         data_vector: vec![2,3,4,5],</span>
<span class="doccomment">//!     };</span>
<span class="doccomment">//!</span>
<span class="doccomment">//!     // Serialize using `json::encode`</span>
<span class="doccomment">//!     let encoded = json::encode(&amp;object).unwrap();</span>
<span class="doccomment">//!</span>
<span class="doccomment">//!     // Deserialize using `json::decode`</span>
<span class="doccomment">//!     let decoded: TestStruct = json::decode(&amp;encoded).unwrap();</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Using the `ToJson` trait</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The examples below use the `ToJson` trait to generate the JSON string,</span>
<span class="doccomment">//! which is required for custom mappings.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ### Simple example of `ToJson` usage</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! extern crate rustc_serialize;</span>
<span class="doccomment">//! use rustc_serialize::json::{self, ToJson, Json};</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // A custom data structure</span>
<span class="doccomment">//! struct ComplexNum {</span>
<span class="doccomment">//!     a: f64,</span>
<span class="doccomment">//!     b: f64,</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // JSON value representation</span>
<span class="doccomment">//! impl ToJson for ComplexNum {</span>
<span class="doccomment">//!     fn to_json(&amp;self) -&gt; Json {</span>
<span class="doccomment">//!         Json::String(format!(&quot;{}+{}i&quot;, self.a, self.b))</span>
<span class="doccomment">//!     }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // Only generate `RustcEncodable` trait implementation</span>
<span class="doccomment">//! #[derive(RustcEncodable)]</span>
<span class="doccomment">//! pub struct ComplexNumRecord {</span>
<span class="doccomment">//!     uid: u8,</span>
<span class="doccomment">//!     dsc: String,</span>
<span class="doccomment">//!     val: Json,</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn main() {</span>
<span class="doccomment">//!     let num = ComplexNum { a: 0.0001, b: 12.539 };</span>
<span class="doccomment">//!     let data: String = json::encode(&amp;ComplexNumRecord{</span>
<span class="doccomment">//!         uid: 1,</span>
<span class="doccomment">//!         dsc: &quot;test&quot;.to_string(),</span>
<span class="doccomment">//!         val: num.to_json(),</span>
<span class="doccomment">//!     }).unwrap();</span>
<span class="doccomment">//!     println!(&quot;data: {}&quot;, data);</span>
<span class="doccomment">//!     // data: {&quot;uid&quot;:1,&quot;dsc&quot;:&quot;test&quot;,&quot;val&quot;:&quot;0.0001+12.539i&quot;};</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ### Verbose example of `ToJson` usage</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! extern crate rustc_serialize;</span>
<span class="doccomment">//! use std::collections::BTreeMap;</span>
<span class="doccomment">//! use rustc_serialize::json::{self, Json, ToJson};</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // Only generate `Decodable` trait implementation</span>
<span class="doccomment">//! #[derive(RustcDecodable)]</span>
<span class="doccomment">//! pub struct TestStruct {</span>
<span class="doccomment">//!     data_int: u8,</span>
<span class="doccomment">//!     data_str: String,</span>
<span class="doccomment">//!     data_vector: Vec&lt;u8&gt;,</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // Specify encoding method manually</span>
<span class="doccomment">//! impl ToJson for TestStruct {</span>
<span class="doccomment">//!     fn to_json(&amp;self) -&gt; Json {</span>
<span class="doccomment">//!         let mut d = BTreeMap::new();</span>
<span class="doccomment">//!         // All standard types implement `to_json()`, so use it</span>
<span class="doccomment">//!         d.insert(&quot;data_int&quot;.to_string(), self.data_int.to_json());</span>
<span class="doccomment">//!         d.insert(&quot;data_str&quot;.to_string(), self.data_str.to_json());</span>
<span class="doccomment">//!         d.insert(&quot;data_vector&quot;.to_string(), self.data_vector.to_json());</span>
<span class="doccomment">//!         Json::Object(d)</span>
<span class="doccomment">//!     }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn main() {</span>
<span class="doccomment">//!     // Serialize using `ToJson`</span>
<span class="doccomment">//!     let input_data = TestStruct {</span>
<span class="doccomment">//!         data_int: 1,</span>
<span class="doccomment">//!         data_str: &quot;madoka&quot;.to_string(),</span>
<span class="doccomment">//!         data_vector: vec![2,3,4,5],</span>
<span class="doccomment">//!     };</span>
<span class="doccomment">//!     let json_obj: Json = input_data.to_json();</span>
<span class="doccomment">//!     let json_str: String = json_obj.to_string();</span>
<span class="doccomment">//!</span>
<span class="doccomment">//!     // Deserialize like before</span>
<span class="doccomment">//!     let decoded: TestStruct = json::decode(&amp;json_str).unwrap();</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Parsing a `str` to `Json` and reading the result</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! extern crate rustc_serialize;</span>
<span class="doccomment">//! use rustc_serialize::json::Json;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn main() {</span>
<span class="doccomment">//!     let data = Json::from_str(&quot;{\&quot;foo\&quot;: 13, \&quot;bar\&quot;: \&quot;baz\&quot;}&quot;).unwrap();</span>
<span class="doccomment">//!     println!(&quot;data: {}&quot;, data);</span>
<span class="doccomment">//!     // data: {&quot;bar&quot;:&quot;baz&quot;,&quot;foo&quot;:13}</span>
<span class="doccomment">//!     println!(&quot;object? {}&quot;, data.is_object());</span>
<span class="doccomment">//!     // object? true</span>
<span class="doccomment">//!</span>
<span class="doccomment">//!     let obj = data.as_object().unwrap();</span>
<span class="doccomment">//!     let foo = obj.get(&quot;foo&quot;).unwrap();</span>
<span class="doccomment">//!</span>
<span class="doccomment">//!     println!(&quot;array? {:?}&quot;, foo.as_array());</span>
<span class="doccomment">//!     // array? None</span>
<span class="doccomment">//!     println!(&quot;u64? {:?}&quot;, foo.as_u64());</span>
<span class="doccomment">//!     // u64? Some(13u64)</span>
<span class="doccomment">//!</span>
<span class="doccomment">//!     for (key, value) in obj.iter() {</span>
<span class="doccomment">//!         println!(&quot;{}: {}&quot;, key, match *value {</span>
<span class="doccomment">//!             Json::U64(v) =&gt; format!(&quot;{} (u64)&quot;, v),</span>
<span class="doccomment">//!             Json::String(ref v) =&gt; format!(&quot;{} (string)&quot;, v),</span>
<span class="doccomment">//!             _ =&gt; format!(&quot;other&quot;)</span>
<span class="doccomment">//!         });</span>
<span class="doccomment">//!     }</span>
<span class="doccomment">//!     // bar: baz (string)</span>
<span class="doccomment">//!     // foo: 13 (u64)</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # The status of this library</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! While this library is the standard way of working with JSON in Rust,</span>
<span class="doccomment">//! there is a next-generation library called Serde that&#39;s in the works (it&#39;s</span>
<span class="doccomment">//! faster, overcomes some design limitations of rustc-serialize and has more</span>
<span class="doccomment">//! features). You might consider using it when starting a new project or</span>
<span class="doccomment">//! evaluating Rust JSON performance.</span>

<span class="kw">use</span> <span class="self">self</span>::<span class="ident">JsonEvent</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="self">self</span>::<span class="ident">ErrorCode</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="self">self</span>::<span class="ident">ParserError</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="self">self</span>::<span class="ident">DecoderError</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="self">self</span>::<span class="ident">ParserState</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="self">self</span>::<span class="ident">InternalStackElement</span>::<span class="kw-2">*</span>;

<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::{<span class="ident">HashMap</span>, <span class="ident">BTreeMap</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">error</span>::<span class="ident">Error</span> <span class="kw">as</span> <span class="ident">StdError</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">i64</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">prelude</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>::<span class="ident">swap</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ops</span>::<span class="ident">Index</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">str</span>::<span class="ident">FromStr</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">string</span>;
<span class="kw">use</span> <span class="ident">std</span>::{<span class="ident">char</span>, <span class="ident">f64</span>, <span class="ident">fmt</span>, <span class="ident">io</span>, <span class="ident">str</span>};

<span class="kw">use</span> <span class="ident">Encodable</span>;

<span class="doccomment">/// Represents a json value</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">PartialEq</span>, <span class="ident">PartialOrd</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Json</span> {
    <span class="ident">I64</span>(<span class="ident">i64</span>),
    <span class="ident">U64</span>(<span class="ident">u64</span>),
    <span class="ident">F64</span>(<span class="ident">f64</span>),
    <span class="ident">String</span>(<span class="ident">string</span>::<span class="ident">String</span>),
    <span class="ident">Boolean</span>(<span class="ident">bool</span>),
    <span class="ident">Array</span>(<span class="self">self</span>::<span class="ident">Array</span>),
    <span class="ident">Object</span>(<span class="self">self</span>::<span class="ident">Object</span>),
    <span class="ident">Null</span>,
}

<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">Array</span> <span class="op">=</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Json</span><span class="op">&gt;</span>;
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">Object</span> <span class="op">=</span> <span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">string</span>::<span class="ident">String</span>, <span class="ident">Json</span><span class="op">&gt;</span>;

<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">PrettyJson</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> { <span class="ident">inner</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">Json</span> }

<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">AsJson</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>: <span class="lifetime">&#39;a</span><span class="op">&gt;</span> { <span class="ident">inner</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">T</span> }
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">AsPrettyJson</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>: <span class="lifetime">&#39;a</span><span class="op">&gt;</span> { <span class="ident">inner</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">T</span>, <span class="ident">indent</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span> }

<span class="doccomment">/// The errors that can arise while parsing a JSON stream.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">ErrorCode</span> {
    <span class="ident">InvalidSyntax</span>,
    <span class="ident">InvalidNumber</span>,
    <span class="ident">EOFWhileParsingObject</span>,
    <span class="ident">EOFWhileParsingArray</span>,
    <span class="ident">EOFWhileParsingValue</span>,
    <span class="ident">EOFWhileParsingString</span>,
    <span class="ident">KeyMustBeAString</span>,
    <span class="ident">ExpectedColon</span>,
    <span class="ident">TrailingCharacters</span>,
    <span class="ident">TrailingComma</span>,
    <span class="ident">InvalidEscape</span>,
    <span class="ident">InvalidUnicodeCodePoint</span>,
    <span class="ident">LoneLeadingSurrogateInHexEscape</span>,
    <span class="ident">UnexpectedEndOfHexEscape</span>,
    <span class="ident">UnrecognizedHex</span>,
    <span class="ident">NotFourDigit</span>,
    <span class="ident">ControlCharacterInString</span>,
    <span class="ident">NotUtf8</span>,
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">ParserError</span> {
    <span class="doccomment">/// msg, line, col</span>
    <span class="ident">SyntaxError</span>(<span class="ident">ErrorCode</span>, <span class="ident">usize</span>, <span class="ident">usize</span>),
    <span class="ident">IoError</span>(<span class="ident">io</span>::<span class="ident">Error</span>),
}

<span class="kw">impl</span> <span class="ident">PartialEq</span> <span class="kw">for</span> <span class="ident">ParserError</span> {
    <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">ParserError</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">match</span> (<span class="self">self</span>, <span class="ident">other</span>) {
            (<span class="kw-2">&amp;</span><span class="ident">SyntaxError</span>(<span class="ident">msg0</span>, <span class="ident">line0</span>, <span class="ident">col0</span>), <span class="kw-2">&amp;</span><span class="ident">SyntaxError</span>(<span class="ident">msg1</span>, <span class="ident">line1</span>, <span class="ident">col1</span>)) <span class="op">=&gt;</span>
                <span class="ident">msg0</span> <span class="op">==</span> <span class="ident">msg1</span> <span class="op">&amp;&amp;</span> <span class="ident">line0</span> <span class="op">==</span> <span class="ident">line1</span> <span class="op">&amp;&amp;</span> <span class="ident">col0</span> <span class="op">==</span> <span class="ident">col1</span>,
            (<span class="kw-2">&amp;</span><span class="ident">IoError</span>(_), _) <span class="op">=&gt;</span> <span class="bool-val">false</span>,
            (_, <span class="kw-2">&amp;</span><span class="ident">IoError</span>(_)) <span class="op">=&gt;</span> <span class="bool-val">false</span>,
        }
    }
}

<span class="comment">// Builder and Parser have the same errors.</span>
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">BuilderError</span> <span class="op">=</span> <span class="ident">ParserError</span>;

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">DecoderError</span> {
    <span class="ident">ParseError</span>(<span class="ident">ParserError</span>),
    <span class="ident">ExpectedError</span>(<span class="ident">string</span>::<span class="ident">String</span>, <span class="ident">string</span>::<span class="ident">String</span>),
    <span class="ident">MissingFieldError</span>(<span class="ident">string</span>::<span class="ident">String</span>),
    <span class="ident">UnknownVariantError</span>(<span class="ident">string</span>::<span class="ident">String</span>),
    <span class="ident">ApplicationError</span>(<span class="ident">string</span>::<span class="ident">String</span>),
    <span class="ident">EOF</span>,
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">EncoderError</span> {
    <span class="ident">FmtError</span>(<span class="ident">fmt</span>::<span class="ident">Error</span>),
    <span class="ident">BadHashmapKey</span>,
}

<span class="kw">impl</span> <span class="ident">PartialEq</span> <span class="kw">for</span> <span class="ident">EncoderError</span> {
    <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">EncoderError</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">match</span> (<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">*</span><span class="ident">other</span>) {
            (<span class="ident">EncoderError</span>::<span class="ident">FmtError</span>(_), <span class="ident">EncoderError</span>::<span class="ident">FmtError</span>(_)) <span class="op">=&gt;</span> <span class="bool-val">true</span>,
            (<span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>, <span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>) <span class="op">=&gt;</span> <span class="bool-val">true</span>,
            _ <span class="op">=&gt;</span> <span class="bool-val">false</span>,
        }
    }
}

<span class="kw">impl</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">EncoderError</span> {
    <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="self">Self</span> { <span class="kw-2">*</span><span class="self">self</span> }
}

<span class="doccomment">/// Returns a readable error string for a given error code.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">error_str</span>(<span class="ident">error</span>: <span class="ident">ErrorCode</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span> {
    <span class="kw">match</span> <span class="ident">error</span> {
        <span class="ident">InvalidSyntax</span> <span class="op">=&gt;</span> <span class="string">&quot;invalid syntax&quot;</span>,
        <span class="ident">InvalidNumber</span> <span class="op">=&gt;</span> <span class="string">&quot;invalid number&quot;</span>,
        <span class="ident">EOFWhileParsingObject</span> <span class="op">=&gt;</span> <span class="string">&quot;EOF While parsing object&quot;</span>,
        <span class="ident">EOFWhileParsingArray</span> <span class="op">=&gt;</span> <span class="string">&quot;EOF While parsing array&quot;</span>,
        <span class="ident">EOFWhileParsingValue</span> <span class="op">=&gt;</span> <span class="string">&quot;EOF While parsing value&quot;</span>,
        <span class="ident">EOFWhileParsingString</span> <span class="op">=&gt;</span> <span class="string">&quot;EOF While parsing string&quot;</span>,
        <span class="ident">KeyMustBeAString</span> <span class="op">=&gt;</span> <span class="string">&quot;key must be a string&quot;</span>,
        <span class="ident">ExpectedColon</span> <span class="op">=&gt;</span> <span class="string">&quot;expected `:`&quot;</span>,
        <span class="ident">TrailingCharacters</span> <span class="op">=&gt;</span> <span class="string">&quot;trailing characters&quot;</span>,
        <span class="ident">TrailingComma</span> <span class="op">=&gt;</span> <span class="string">&quot;trailing comma&quot;</span>,
        <span class="ident">InvalidEscape</span> <span class="op">=&gt;</span> <span class="string">&quot;invalid escape&quot;</span>,
        <span class="ident">UnrecognizedHex</span> <span class="op">=&gt;</span> <span class="string">&quot;invalid \\u{ esc}ape (unrecognized hex)&quot;</span>,
        <span class="ident">NotFourDigit</span> <span class="op">=&gt;</span> <span class="string">&quot;invalid \\u{ esc}ape (not four digits)&quot;</span>,
        <span class="ident">ControlCharacterInString</span> <span class="op">=&gt;</span> <span class="string">&quot;unescaped control character in string&quot;</span>,
        <span class="ident">NotUtf8</span> <span class="op">=&gt;</span> <span class="string">&quot;contents not utf-8&quot;</span>,
        <span class="ident">InvalidUnicodeCodePoint</span> <span class="op">=&gt;</span> <span class="string">&quot;invalid Unicode code point&quot;</span>,
        <span class="ident">LoneLeadingSurrogateInHexEscape</span> <span class="op">=&gt;</span> <span class="string">&quot;lone leading surrogate in hex escape&quot;</span>,
        <span class="ident">UnexpectedEndOfHexEscape</span> <span class="op">=&gt;</span> <span class="string">&quot;unexpected end of hex escape&quot;</span>,
    }
}

<span class="doccomment">/// Shortcut function to decode a JSON `&amp;str` into an object</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">decode</span><span class="op">&lt;</span><span class="ident">T</span>: ::<span class="ident">Decodable</span><span class="op">&gt;</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">let</span> <span class="ident">json</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="ident">s</span>) {
        <span class="prelude-val">Ok</span>(<span class="ident">x</span>) <span class="op">=&gt;</span> <span class="ident">x</span>,
        <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ParseError</span>(<span class="ident">e</span>))
    };

    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">decoder</span> <span class="op">=</span> <span class="ident">Decoder</span>::<span class="ident">new</span>(<span class="ident">json</span>);
    ::<span class="ident">Decodable</span>::<span class="ident">decode</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">decoder</span>)
}

<span class="doccomment">/// Shortcut function to encode a `T` into a JSON `String`</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">encode</span><span class="op">&lt;</span><span class="ident">T</span>: ::<span class="ident">Encodable</span><span class="op">&gt;</span>(<span class="ident">object</span>: <span class="kw-2">&amp;</span><span class="ident">T</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span><span class="ident">string</span>::<span class="ident">String</span><span class="op">&gt;</span> {
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">new</span>();
    {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">encoder</span> <span class="op">=</span> <span class="ident">Encoder</span>::<span class="ident">new</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">s</span>);
        <span class="macro">try</span><span class="macro">!</span>(<span class="ident">object</span>.<span class="ident">encode</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">encoder</span>));
    }
    <span class="prelude-val">Ok</span>(<span class="ident">s</span>)
}

<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">ErrorCode</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="ident">error_str</span>(<span class="kw-2">*</span><span class="self">self</span>).<span class="ident">fmt</span>(<span class="ident">f</span>)
    }
}

<span class="kw">impl</span> <span class="ident">StdError</span> <span class="kw">for</span> <span class="ident">DecoderError</span> {
    <span class="kw">fn</span> <span class="ident">description</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">str</span> { <span class="string">&quot;decoder error&quot;</span> }
    <span class="kw">fn</span> <span class="ident">cause</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">StdError</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
            <span class="ident">DecoderError</span>::<span class="ident">ParseError</span>(<span class="kw-2">ref</span> <span class="ident">e</span>) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">e</span>),
            _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>,
        }
    }
}

<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">DecoderError</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="ident">fmt</span>::<span class="ident">Debug</span>::<span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>)
    }
}

<span class="kw">impl</span> <span class="ident">From</span><span class="op">&lt;</span><span class="ident">ParserError</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">DecoderError</span> {
    <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">err</span>: <span class="ident">ParserError</span>) <span class="op">-&gt;</span> <span class="ident">DecoderError</span> {
        <span class="ident">ParseError</span>(<span class="ident">From</span>::<span class="ident">from</span>(<span class="ident">err</span>))
    }
}

<span class="kw">impl</span> <span class="ident">StdError</span> <span class="kw">for</span> <span class="ident">ParserError</span> {
    <span class="kw">fn</span> <span class="ident">description</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">str</span> { <span class="string">&quot;failed to parse json&quot;</span> }
}

<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">ParserError</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="ident">fmt</span>::<span class="ident">Debug</span>::<span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>)
    }
}

<span class="kw">impl</span> <span class="ident">From</span><span class="op">&lt;</span><span class="ident">io</span>::<span class="ident">Error</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">ParserError</span> {
    <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">err</span>: <span class="ident">io</span>::<span class="ident">Error</span>) <span class="op">-&gt;</span> <span class="ident">ParserError</span> {
        <span class="ident">IoError</span>(<span class="ident">err</span>)
    }
}

<span class="kw">impl</span> <span class="ident">StdError</span> <span class="kw">for</span> <span class="ident">EncoderError</span> {
    <span class="kw">fn</span> <span class="ident">description</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">str</span> { <span class="string">&quot;encoder error&quot;</span> }
}

<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">EncoderError</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="ident">fmt</span>::<span class="ident">Debug</span>::<span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>)
    }
}

<span class="kw">impl</span> <span class="ident">From</span><span class="op">&lt;</span><span class="ident">fmt</span>::<span class="ident">Error</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">EncoderError</span> {
    <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">err</span>: <span class="ident">fmt</span>::<span class="ident">Error</span>) <span class="op">-&gt;</span> <span class="ident">EncoderError</span> { <span class="ident">EncoderError</span>::<span class="ident">FmtError</span>(<span class="ident">err</span>) }
}

<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="op">=</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">EncoderError</span><span class="op">&gt;</span>;
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="op">=</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">DecoderError</span><span class="op">&gt;</span>;

<span class="kw">fn</span> <span class="ident">escape_str</span>(<span class="ident">wr</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Write</span>, <span class="ident">v</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
    <span class="macro">try</span><span class="macro">!</span>(<span class="ident">wr</span>.<span class="ident">write_str</span>(<span class="string">&quot;\&quot;&quot;</span>));

    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">start</span> <span class="op">=</span> <span class="number">0</span>;

    <span class="kw">for</span> (<span class="ident">i</span>, <span class="ident">byte</span>) <span class="kw">in</span> <span class="ident">v</span>.<span class="ident">bytes</span>().<span class="ident">enumerate</span>() {
        <span class="kw">let</span> <span class="ident">escaped</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">byte</span> {
            <span class="string">b&#39;&quot;&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\\&quot;&quot;</span>,
            <span class="string">b&#39;\\&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\\\&quot;</span>,
            <span class="string">b&#39;\x00&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u0000&quot;</span>,
            <span class="string">b&#39;\x01&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u0001&quot;</span>,
            <span class="string">b&#39;\x02&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u0002&quot;</span>,
            <span class="string">b&#39;\x03&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u0003&quot;</span>,
            <span class="string">b&#39;\x04&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u0004&quot;</span>,
            <span class="string">b&#39;\x05&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u0005&quot;</span>,
            <span class="string">b&#39;\x06&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u0006&quot;</span>,
            <span class="string">b&#39;\x07&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u0007&quot;</span>,
            <span class="string">b&#39;\x08&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\b&quot;</span>,
            <span class="string">b&#39;\t&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\t&quot;</span>,
            <span class="string">b&#39;\n&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\n&quot;</span>,
            <span class="string">b&#39;\x0b&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u000b&quot;</span>,
            <span class="string">b&#39;\x0c&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\f&quot;</span>,
            <span class="string">b&#39;\r&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\r&quot;</span>,
            <span class="string">b&#39;\x0e&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u000e&quot;</span>,
            <span class="string">b&#39;\x0f&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u000f&quot;</span>,
            <span class="string">b&#39;\x10&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u0010&quot;</span>,
            <span class="string">b&#39;\x11&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u0011&quot;</span>,
            <span class="string">b&#39;\x12&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u0012&quot;</span>,
            <span class="string">b&#39;\x13&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u0013&quot;</span>,
            <span class="string">b&#39;\x14&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u0014&quot;</span>,
            <span class="string">b&#39;\x15&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u0015&quot;</span>,
            <span class="string">b&#39;\x16&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u0016&quot;</span>,
            <span class="string">b&#39;\x17&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u0017&quot;</span>,
            <span class="string">b&#39;\x18&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u0018&quot;</span>,
            <span class="string">b&#39;\x19&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u0019&quot;</span>,
            <span class="string">b&#39;\x1a&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u001a&quot;</span>,
            <span class="string">b&#39;\x1b&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u001b&quot;</span>,
            <span class="string">b&#39;\x1c&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u001c&quot;</span>,
            <span class="string">b&#39;\x1d&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u001d&quot;</span>,
            <span class="string">b&#39;\x1e&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u001e&quot;</span>,
            <span class="string">b&#39;\x1f&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u001f&quot;</span>,
            <span class="string">b&#39;\x7f&#39;</span> <span class="op">=&gt;</span> <span class="string">&quot;\\u007f&quot;</span>,
            _ <span class="op">=&gt;</span> { <span class="kw">continue</span>; }
        };

        <span class="kw">if</span> <span class="ident">start</span> <span class="op">&lt;</span> <span class="ident">i</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="ident">wr</span>.<span class="ident">write_str</span>(<span class="kw-2">&amp;</span><span class="ident">v</span>[<span class="ident">start</span>..<span class="ident">i</span>]));
        }

        <span class="macro">try</span><span class="macro">!</span>(<span class="ident">wr</span>.<span class="ident">write_str</span>(<span class="ident">escaped</span>));

        <span class="ident">start</span> <span class="op">=</span> <span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>;
    }

    <span class="kw">if</span> <span class="ident">start</span> <span class="op">!=</span> <span class="ident">v</span>.<span class="ident">len</span>() {
        <span class="macro">try</span><span class="macro">!</span>(<span class="ident">wr</span>.<span class="ident">write_str</span>(<span class="kw-2">&amp;</span><span class="ident">v</span>[<span class="ident">start</span>..]));
    }

    <span class="macro">try</span><span class="macro">!</span>(<span class="ident">wr</span>.<span class="ident">write_str</span>(<span class="string">&quot;\&quot;&quot;</span>));
    <span class="prelude-val">Ok</span>(())
}

<span class="kw">fn</span> <span class="ident">escape_char</span>(<span class="ident">writer</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Write</span>, <span class="ident">v</span>: <span class="ident">char</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> [<span class="number">0</span>; <span class="number">4</span>];
    <span class="kw">let</span> _ <span class="op">=</span> <span class="macro">write</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">buf</span>[..], <span class="string">&quot;{}&quot;</span>, <span class="ident">v</span>);
    <span class="kw">let</span> <span class="ident">buf</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">str</span>::<span class="ident">from_utf8_unchecked</span>(<span class="kw-2">&amp;</span><span class="ident">buf</span>[..<span class="ident">v</span>.<span class="ident">len_utf8</span>()]) };
    <span class="ident">escape_str</span>(<span class="ident">writer</span>, <span class="ident">buf</span>)
}

<span class="kw">fn</span> <span class="ident">spaces</span>(<span class="ident">wr</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Write</span>, <span class="ident">n</span>: <span class="ident">u32</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">n</span> <span class="kw">as</span> <span class="ident">usize</span>;
    <span class="kw">const</span> <span class="ident">BUF</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span> <span class="op">=</span> <span class="string">&quot;                &quot;</span>;

    <span class="kw">while</span> <span class="ident">n</span> <span class="op">&gt;=</span> <span class="ident">BUF</span>.<span class="ident">len</span>() {
        <span class="macro">try</span><span class="macro">!</span>(<span class="ident">wr</span>.<span class="ident">write_str</span>(<span class="ident">BUF</span>));
        <span class="ident">n</span> <span class="op">-=</span> <span class="ident">BUF</span>.<span class="ident">len</span>();
    }

    <span class="kw">if</span> <span class="ident">n</span> <span class="op">&gt;</span> <span class="number">0</span> {
        <span class="macro">try</span><span class="macro">!</span>(<span class="ident">wr</span>.<span class="ident">write_str</span>(<span class="kw-2">&amp;</span><span class="ident">BUF</span>[..<span class="ident">n</span>]));
    }
    <span class="prelude-val">Ok</span>(())
}

<span class="kw">fn</span> <span class="ident">fmt_number_or_null</span>(<span class="ident">v</span>: <span class="ident">f64</span>) <span class="op">-&gt;</span> <span class="ident">string</span>::<span class="ident">String</span> {
    <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">num</span>::<span class="ident">FpCategory</span>::{<span class="ident">Nan</span>, <span class="ident">Infinite</span>};

    <span class="kw">match</span> <span class="ident">v</span>.<span class="ident">classify</span>() {
        <span class="ident">Nan</span> <span class="op">|</span> <span class="ident">Infinite</span> <span class="op">=&gt;</span> <span class="string">&quot;null&quot;</span>.<span class="ident">to_string</span>(),
        _ <span class="op">=&gt;</span> {
            <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">v</span>.<span class="ident">to_string</span>();
            <span class="kw">if</span> <span class="ident">s</span>.<span class="ident">contains</span>(<span class="string">&quot;.&quot;</span>) {<span class="ident">s</span>} <span class="kw">else</span> {<span class="ident">s</span> <span class="op">+</span> <span class="string">&quot;.0&quot;</span>}
        }
    }
}

<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">emit_enquoted_if_mapkey</span> {
    (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">enc</span>:<span class="ident">ident</span>,<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> {
        <span class="kw">if</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">enc</span>.<span class="ident">is_emitting_map_key</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">enc</span>.<span class="ident">writer</span>, <span class="string">&quot;\&quot;{}\&quot;&quot;</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>));
            <span class="prelude-val">Ok</span>(())
        } <span class="kw">else</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">enc</span>.<span class="ident">writer</span>, <span class="string">&quot;{}&quot;</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>));
            <span class="prelude-val">Ok</span>(())
        }
    }
}

<span class="kw">enum</span> <span class="ident">EncodingFormat</span> {
    <span class="ident">Compact</span>,
    <span class="ident">Pretty</span> {
        <span class="ident">curr_indent</span>: <span class="ident">u32</span>,
        <span class="ident">indent</span>: <span class="ident">u32</span>
    }
}

<span class="doccomment">/// A structure for implementing serialization to JSON.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
    <span class="ident">writer</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> (<span class="ident">fmt</span>::<span class="ident">Write</span><span class="op">+</span><span class="lifetime">&#39;a</span>),
    <span class="ident">format</span> : <span class="ident">EncodingFormat</span>,
    <span class="ident">is_emitting_map_key</span>: <span class="ident">bool</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
    <span class="doccomment">/// Creates a new encoder whose output will be written in human-readable</span>
    <span class="doccomment">/// JSON to the specified writer</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_pretty</span>(<span class="ident">writer</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Write</span>) <span class="op">-&gt;</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
        <span class="ident">Encoder</span> {
            <span class="ident">writer</span>: <span class="ident">writer</span>,
            <span class="ident">format</span>: <span class="ident">EncodingFormat</span>::<span class="ident">Pretty</span> {
                <span class="ident">curr_indent</span>: <span class="number">0</span>,
                <span class="ident">indent</span>: <span class="number">2</span>,
            },
            <span class="ident">is_emitting_map_key</span>: <span class="bool-val">false</span>,
        }
    }

    <span class="doccomment">/// Creates a new encoder whose output will be written in compact</span>
    <span class="doccomment">/// JSON to the specified writer</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">writer</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Write</span>) <span class="op">-&gt;</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
        <span class="ident">Encoder</span> {
            <span class="ident">writer</span>: <span class="ident">writer</span>,
            <span class="ident">format</span>: <span class="ident">EncodingFormat</span>::<span class="ident">Compact</span>,
            <span class="ident">is_emitting_map_key</span>: <span class="bool-val">false</span>,
        }
    }

    <span class="doccomment">/// Set the number of spaces to indent for each level.</span>
    <span class="doccomment">/// This is safe to set during encoding.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_indent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">new_indent</span>: <span class="ident">u32</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), ()<span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="kw">let</span> <span class="ident">EncodingFormat</span>::<span class="ident">Pretty</span>{<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">curr_indent</span>, <span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">indent</span>} <span class="op">=</span> <span class="self">self</span>.<span class="ident">format</span> {
            <span class="comment">// self.indent very well could be 0 so we need to use checked division.</span>
            <span class="kw">let</span> <span class="ident">level</span> <span class="op">=</span> <span class="ident">curr_indent</span>.<span class="ident">checked_div</span>(<span class="kw-2">*</span><span class="ident">indent</span>).<span class="ident">unwrap_or</span>(<span class="number">0</span>);
            <span class="kw-2">*</span><span class="ident">indent</span> <span class="op">=</span> <span class="ident">new_indent</span>;
            <span class="kw-2">*</span><span class="ident">curr_indent</span> <span class="op">=</span> <span class="ident">level</span> <span class="op">*</span> <span class="kw-2">*</span><span class="ident">indent</span>;
            <span class="prelude-val">Ok</span>(())
        } <span class="kw">else</span> {
            <span class="prelude-val">Err</span>(())
        }
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> ::<span class="ident">Encoder</span> <span class="kw">for</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">EncoderError</span>;

    <span class="kw">fn</span> <span class="ident">emit_nil</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>); }
        <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;null&quot;</span>));
        <span class="prelude-val">Ok</span>(())
    }

    <span class="kw">fn</span> <span class="ident">emit_usize</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">v</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> { <span class="macro">emit_enquoted_if_mapkey</span><span class="macro">!</span>(<span class="self">self</span>, <span class="ident">v</span>) }
    <span class="kw">fn</span> <span class="ident">emit_u64</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">v</span>: <span class="ident">u64</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> { <span class="macro">emit_enquoted_if_mapkey</span><span class="macro">!</span>(<span class="self">self</span>, <span class="ident">v</span>) }
    <span class="kw">fn</span> <span class="ident">emit_u32</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">v</span>: <span class="ident">u32</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> { <span class="macro">emit_enquoted_if_mapkey</span><span class="macro">!</span>(<span class="self">self</span>, <span class="ident">v</span>) }
    <span class="kw">fn</span> <span class="ident">emit_u16</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">v</span>: <span class="ident">u16</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> { <span class="macro">emit_enquoted_if_mapkey</span><span class="macro">!</span>(<span class="self">self</span>, <span class="ident">v</span>) }
    <span class="kw">fn</span> <span class="ident">emit_u8</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">v</span>: <span class="ident">u8</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> { <span class="macro">emit_enquoted_if_mapkey</span><span class="macro">!</span>(<span class="self">self</span>, <span class="ident">v</span>) }

    <span class="kw">fn</span> <span class="ident">emit_isize</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">v</span>: <span class="ident">isize</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> { <span class="macro">emit_enquoted_if_mapkey</span><span class="macro">!</span>(<span class="self">self</span>, <span class="ident">v</span>) }
    <span class="kw">fn</span> <span class="ident">emit_i64</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">v</span>: <span class="ident">i64</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> { <span class="macro">emit_enquoted_if_mapkey</span><span class="macro">!</span>(<span class="self">self</span>, <span class="ident">v</span>) }
    <span class="kw">fn</span> <span class="ident">emit_i32</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">v</span>: <span class="ident">i32</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> { <span class="macro">emit_enquoted_if_mapkey</span><span class="macro">!</span>(<span class="self">self</span>, <span class="ident">v</span>) }
    <span class="kw">fn</span> <span class="ident">emit_i16</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">v</span>: <span class="ident">i16</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> { <span class="macro">emit_enquoted_if_mapkey</span><span class="macro">!</span>(<span class="self">self</span>, <span class="ident">v</span>) }
    <span class="kw">fn</span> <span class="ident">emit_i8</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">v</span>: <span class="ident">i8</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> { <span class="macro">emit_enquoted_if_mapkey</span><span class="macro">!</span>(<span class="self">self</span>, <span class="ident">v</span>) }

    <span class="kw">fn</span> <span class="ident">emit_bool</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">v</span>: <span class="ident">bool</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>); }
        <span class="kw">if</span> <span class="ident">v</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;true&quot;</span>));
        } <span class="kw">else</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;false&quot;</span>));
        }
        <span class="prelude-val">Ok</span>(())
    }

    <span class="kw">fn</span> <span class="ident">emit_f64</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">v</span>: <span class="ident">f64</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="macro">emit_enquoted_if_mapkey</span><span class="macro">!</span>(<span class="self">self</span>, <span class="ident">fmt_number_or_null</span>(<span class="ident">v</span>))
    }
    <span class="kw">fn</span> <span class="ident">emit_f32</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">v</span>: <span class="ident">f32</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">emit_f64</span>(<span class="ident">v</span> <span class="kw">as</span> <span class="ident">f64</span>)
    }

    <span class="kw">fn</span> <span class="ident">emit_char</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">v</span>: <span class="ident">char</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="ident">escape_char</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="ident">v</span>)
    }
    <span class="kw">fn</span> <span class="ident">emit_str</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">v</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="ident">escape_str</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="ident">v</span>)
    }

    <span class="kw">fn</span> <span class="ident">emit_enum</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">_name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span>,
    {
        <span class="ident">f</span>(<span class="self">self</span>)
    }

    <span class="kw">fn</span> <span class="ident">emit_enum_variant</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>,
                            <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>,
                            <span class="ident">_id</span>: <span class="ident">usize</span>,
                            <span class="ident">cnt</span>: <span class="ident">usize</span>,
                            <span class="ident">f</span>: <span class="ident">F</span>)
                            <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span>,
    {
        <span class="comment">// enums are encoded as strings or objects</span>
        <span class="comment">// Bunny =&gt; &quot;Bunny&quot;</span>
        <span class="comment">// Kangaroo(34,&quot;William&quot;) =&gt; {&quot;variant&quot;: &quot;Kangaroo&quot;, &quot;fields&quot;: [34,&quot;William&quot;]}</span>
        <span class="kw">if</span> <span class="ident">cnt</span> <span class="op">==</span> <span class="number">0</span> {
            <span class="ident">escape_str</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="ident">name</span>)
        } <span class="kw">else</span> {
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>); }
            <span class="kw">if</span> <span class="kw">let</span> <span class="ident">EncodingFormat</span>::<span class="ident">Pretty</span>{<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">curr_indent</span>, <span class="ident">indent</span>} <span class="op">=</span> <span class="self">self</span>.<span class="ident">format</span> {
                <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;{{\n&quot;</span>));
                <span class="kw-2">*</span><span class="ident">curr_indent</span> <span class="op">+=</span> <span class="ident">indent</span>;
                <span class="macro">try</span><span class="macro">!</span>(<span class="ident">spaces</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="kw-2">*</span><span class="ident">curr_indent</span>));
                <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;\&quot;variant\&quot;: &quot;</span>));
                <span class="macro">try</span><span class="macro">!</span>(<span class="ident">escape_str</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="ident">name</span>));
                <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;,\n&quot;</span>));
                <span class="macro">try</span><span class="macro">!</span>(<span class="ident">spaces</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="kw-2">*</span><span class="ident">curr_indent</span>));
                <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;\&quot;fields\&quot;: [\n&quot;</span>));
                <span class="kw-2">*</span><span class="ident">curr_indent</span> <span class="op">+=</span> <span class="ident">indent</span>;
            } <span class="kw">else</span> {
                <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;{{\&quot;variant\&quot;:&quot;</span>));
                <span class="macro">try</span><span class="macro">!</span>(<span class="ident">escape_str</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="ident">name</span>));
                <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;,\&quot;fields\&quot;:[&quot;</span>));
            }
            <span class="macro">try</span><span class="macro">!</span>(<span class="ident">f</span>(<span class="self">self</span>));
            <span class="kw">if</span> <span class="kw">let</span> <span class="ident">EncodingFormat</span>::<span class="ident">Pretty</span>{<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">curr_indent</span>, <span class="ident">indent</span>} <span class="op">=</span> <span class="self">self</span>.<span class="ident">format</span> {
                <span class="kw-2">*</span><span class="ident">curr_indent</span> <span class="op">-=</span> <span class="ident">indent</span>;
                <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;\n&quot;</span>));
                <span class="macro">try</span><span class="macro">!</span>(<span class="ident">spaces</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="kw-2">*</span><span class="ident">curr_indent</span>));
                <span class="kw-2">*</span><span class="ident">curr_indent</span> <span class="op">-=</span> <span class="ident">indent</span>;
                <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;]\n&quot;</span>));
                <span class="macro">try</span><span class="macro">!</span>(<span class="ident">spaces</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="kw-2">*</span><span class="ident">curr_indent</span>));
                <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;}}&quot;</span>));
            } <span class="kw">else</span> {
                <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;]}}&quot;</span>));
            }
            <span class="prelude-val">Ok</span>(())
        }
    }

    <span class="kw">fn</span> <span class="ident">emit_enum_variant_arg</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">idx</span>: <span class="ident">usize</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span>,
    {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>); }
        <span class="kw">if</span> <span class="ident">idx</span> <span class="op">!=</span> <span class="number">0</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;,&quot;</span>));
            <span class="kw">if</span> <span class="kw">let</span> <span class="ident">EncodingFormat</span>::<span class="ident">Pretty</span>{..} <span class="op">=</span> <span class="self">self</span>.<span class="ident">format</span> {
                <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;\n&quot;</span>));
            }
        }
        <span class="kw">if</span> <span class="kw">let</span> <span class="ident">EncodingFormat</span>::<span class="ident">Pretty</span>{<span class="ident">curr_indent</span>, ..} <span class="op">=</span> <span class="self">self</span>.<span class="ident">format</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="ident">spaces</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="ident">curr_indent</span>));
        }
        <span class="ident">f</span>(<span class="self">self</span>)
    }

    <span class="kw">fn</span> <span class="ident">emit_enum_struct_variant</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>,
                                   <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>,
                                   <span class="ident">id</span>: <span class="ident">usize</span>,
                                   <span class="ident">cnt</span>: <span class="ident">usize</span>,
                                   <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span>,
    {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>); }
        <span class="self">self</span>.<span class="ident">emit_enum_variant</span>(<span class="ident">name</span>, <span class="ident">id</span>, <span class="ident">cnt</span>, <span class="ident">f</span>)
    }

    <span class="kw">fn</span> <span class="ident">emit_enum_struct_variant_field</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>,
                                         _: <span class="kw-2">&amp;</span><span class="ident">str</span>,
                                         <span class="ident">idx</span>: <span class="ident">usize</span>,
                                         <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span>,
    {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>); }
        <span class="self">self</span>.<span class="ident">emit_enum_variant_arg</span>(<span class="ident">idx</span>, <span class="ident">f</span>)
    }


    <span class="kw">fn</span> <span class="ident">emit_struct</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, _: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">len</span>: <span class="ident">usize</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span>,
    {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>); }
        <span class="kw">if</span> <span class="ident">len</span> <span class="op">==</span> <span class="number">0</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;{{}}&quot;</span>));
        } <span class="kw">else</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;{{&quot;</span>));
            <span class="kw">if</span> <span class="kw">let</span> <span class="ident">EncodingFormat</span>::<span class="ident">Pretty</span>{<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">curr_indent</span>, <span class="ident">indent</span>} <span class="op">=</span> <span class="self">self</span>.<span class="ident">format</span> {
                <span class="kw-2">*</span><span class="ident">curr_indent</span> <span class="op">+=</span> <span class="ident">indent</span>;
            }
            <span class="macro">try</span><span class="macro">!</span>(<span class="ident">f</span>(<span class="self">self</span>));
            <span class="kw">if</span> <span class="kw">let</span> <span class="ident">EncodingFormat</span>::<span class="ident">Pretty</span>{<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">curr_indent</span>, <span class="ident">indent</span>} <span class="op">=</span> <span class="self">self</span>.<span class="ident">format</span> {
                <span class="kw-2">*</span><span class="ident">curr_indent</span> <span class="op">-=</span> <span class="ident">indent</span>;
                <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;\n&quot;</span>));
                <span class="macro">try</span><span class="macro">!</span>(<span class="ident">spaces</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="kw-2">*</span><span class="ident">curr_indent</span>));
            }
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;}}&quot;</span>));
        }
        <span class="prelude-val">Ok</span>(())
    }

    <span class="kw">fn</span> <span class="ident">emit_struct_field</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">idx</span>: <span class="ident">usize</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span>,
    {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>); }
        <span class="kw">if</span> <span class="ident">idx</span> <span class="op">!=</span> <span class="number">0</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;,&quot;</span>));
        }
        <span class="kw">if</span> <span class="kw">let</span> <span class="ident">EncodingFormat</span>::<span class="ident">Pretty</span>{<span class="ident">curr_indent</span>, ..} <span class="op">=</span> <span class="self">self</span>.<span class="ident">format</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;\n&quot;</span>));
            <span class="macro">try</span><span class="macro">!</span>(<span class="ident">spaces</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="ident">curr_indent</span>));
        }
        <span class="macro">try</span><span class="macro">!</span>(<span class="ident">escape_str</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="ident">name</span>));
        <span class="kw">if</span> <span class="kw">let</span> <span class="ident">EncodingFormat</span>::<span class="ident">Pretty</span>{..} <span class="op">=</span> <span class="self">self</span>.<span class="ident">format</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;: &quot;</span>));
        } <span class="kw">else</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;:&quot;</span>));
        }
        <span class="ident">f</span>(<span class="self">self</span>)
    }

    <span class="kw">fn</span> <span class="ident">emit_tuple</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">len</span>: <span class="ident">usize</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span>,
    {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>); }
        <span class="self">self</span>.<span class="ident">emit_seq</span>(<span class="ident">len</span>, <span class="ident">f</span>)
    }
    <span class="kw">fn</span> <span class="ident">emit_tuple_arg</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">idx</span>: <span class="ident">usize</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span>,
    {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>); }
        <span class="self">self</span>.<span class="ident">emit_seq_elt</span>(<span class="ident">idx</span>, <span class="ident">f</span>)
    }

    <span class="kw">fn</span> <span class="ident">emit_tuple_struct</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, _: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">len</span>: <span class="ident">usize</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span>,
    {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>); }
        <span class="self">self</span>.<span class="ident">emit_seq</span>(<span class="ident">len</span>, <span class="ident">f</span>)
    }
    <span class="kw">fn</span> <span class="ident">emit_tuple_struct_arg</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">idx</span>: <span class="ident">usize</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span>,
    {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>); }
        <span class="self">self</span>.<span class="ident">emit_seq_elt</span>(<span class="ident">idx</span>, <span class="ident">f</span>)
    }

    <span class="kw">fn</span> <span class="ident">emit_option</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span>,
    {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>); }
        <span class="ident">f</span>(<span class="self">self</span>)
    }
    <span class="kw">fn</span> <span class="ident">emit_option_none</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>); }
        <span class="self">self</span>.<span class="ident">emit_nil</span>()
    }
    <span class="kw">fn</span> <span class="ident">emit_option_some</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span>,
    {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>); }
        <span class="ident">f</span>(<span class="self">self</span>)
    }

    <span class="kw">fn</span> <span class="ident">emit_seq</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">len</span>: <span class="ident">usize</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span>,
    {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>); }
        <span class="kw">if</span> <span class="ident">len</span> <span class="op">==</span> <span class="number">0</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;[]&quot;</span>));
        } <span class="kw">else</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;[&quot;</span>));
            <span class="kw">if</span> <span class="kw">let</span> <span class="ident">EncodingFormat</span>::<span class="ident">Pretty</span>{<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">curr_indent</span>, <span class="ident">indent</span>} <span class="op">=</span> <span class="self">self</span>.<span class="ident">format</span> {
                <span class="kw-2">*</span><span class="ident">curr_indent</span> <span class="op">+=</span> <span class="ident">indent</span>;
            }
            <span class="macro">try</span><span class="macro">!</span>(<span class="ident">f</span>(<span class="self">self</span>));
            <span class="kw">if</span> <span class="kw">let</span> <span class="ident">EncodingFormat</span>::<span class="ident">Pretty</span>{<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">curr_indent</span>, <span class="ident">indent</span>} <span class="op">=</span> <span class="self">self</span>.<span class="ident">format</span> {
                <span class="kw-2">*</span><span class="ident">curr_indent</span> <span class="op">-=</span> <span class="ident">indent</span>;
                <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;\n&quot;</span>));
                <span class="macro">try</span><span class="macro">!</span>(<span class="ident">spaces</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="kw-2">*</span><span class="ident">curr_indent</span>));
            }
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;]&quot;</span>));
        }
        <span class="prelude-val">Ok</span>(())
    }

    <span class="kw">fn</span> <span class="ident">emit_seq_elt</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">idx</span>: <span class="ident">usize</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span>,
    {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>); }
        <span class="kw">if</span> <span class="ident">idx</span> <span class="op">!=</span> <span class="number">0</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;,&quot;</span>));
        }
        <span class="kw">if</span> <span class="kw">let</span> <span class="ident">EncodingFormat</span>::<span class="ident">Pretty</span>{<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">curr_indent</span>, ..} <span class="op">=</span> <span class="self">self</span>.<span class="ident">format</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;\n&quot;</span>));
            <span class="macro">try</span><span class="macro">!</span>(<span class="ident">spaces</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="kw-2">*</span><span class="ident">curr_indent</span>));
        }
        <span class="ident">f</span>(<span class="self">self</span>)
    }

    <span class="kw">fn</span> <span class="ident">emit_map</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">len</span>: <span class="ident">usize</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span>,
    {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>); }
        <span class="kw">if</span> <span class="ident">len</span> <span class="op">==</span> <span class="number">0</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;{{}}&quot;</span>));
        } <span class="kw">else</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;{{&quot;</span>));
            <span class="kw">if</span> <span class="kw">let</span> <span class="ident">EncodingFormat</span>::<span class="ident">Pretty</span>{<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">curr_indent</span>, <span class="ident">indent</span>} <span class="op">=</span> <span class="self">self</span>.<span class="ident">format</span> {
                <span class="kw-2">*</span><span class="ident">curr_indent</span> <span class="op">+=</span> <span class="ident">indent</span>;
            }
            <span class="macro">try</span><span class="macro">!</span>(<span class="ident">f</span>(<span class="self">self</span>));
            <span class="kw">if</span> <span class="kw">let</span> <span class="ident">EncodingFormat</span>::<span class="ident">Pretty</span>{<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">curr_indent</span>, <span class="ident">indent</span>} <span class="op">=</span> <span class="self">self</span>.<span class="ident">format</span> {
                <span class="kw-2">*</span><span class="ident">curr_indent</span> <span class="op">-=</span> <span class="ident">indent</span>;
                <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;\n&quot;</span>));
                <span class="macro">try</span><span class="macro">!</span>(<span class="ident">spaces</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="kw-2">*</span><span class="ident">curr_indent</span>));
            }
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;}}&quot;</span>));
        }
        <span class="prelude-val">Ok</span>(())
    }

    <span class="kw">fn</span> <span class="ident">emit_map_elt_key</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">idx</span>: <span class="ident">usize</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span>,
    {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>); }
        <span class="kw">if</span> <span class="ident">idx</span> <span class="op">!=</span> <span class="number">0</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;,&quot;</span>));
        }
        <span class="kw">if</span> <span class="kw">let</span> <span class="ident">EncodingFormat</span>::<span class="ident">Pretty</span>{<span class="ident">curr_indent</span>, ..} <span class="op">=</span> <span class="self">self</span>.<span class="ident">format</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;\n&quot;</span>));
            <span class="macro">try</span><span class="macro">!</span>(<span class="ident">spaces</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="ident">curr_indent</span>));
        }
        <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> <span class="op">=</span> <span class="bool-val">true</span>;
        <span class="macro">try</span><span class="macro">!</span>(<span class="ident">f</span>(<span class="self">self</span>));
        <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> <span class="op">=</span> <span class="bool-val">false</span>;
        <span class="prelude-val">Ok</span>(())
    }

    <span class="kw">fn</span> <span class="ident">emit_map_elt_val</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">_idx</span>: <span class="ident">usize</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Encoder</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">EncodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span>,
    {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_emitting_map_key</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span>); }
        <span class="kw">if</span> <span class="kw">let</span> <span class="ident">EncodingFormat</span>::<span class="ident">Pretty</span>{..} <span class="op">=</span> <span class="self">self</span>.<span class="ident">format</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;: &quot;</span>));
        } <span class="kw">else</span> {
            <span class="macro">try</span><span class="macro">!</span>(<span class="macro">write</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">writer</span>, <span class="string">&quot;:&quot;</span>));
        }
        <span class="ident">f</span>(<span class="self">self</span>)
    }
}

<span class="kw">impl</span> <span class="ident">Encodable</span> <span class="kw">for</span> <span class="ident">Json</span> {
    <span class="kw">fn</span> <span class="ident">encode</span><span class="op">&lt;</span><span class="ident">S</span>: ::<span class="ident">Encoder</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">e</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">S</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">S</span>::<span class="ident">Error</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
            <span class="ident">Json</span>::<span class="ident">I64</span>(<span class="ident">v</span>) <span class="op">=&gt;</span> <span class="ident">v</span>.<span class="ident">encode</span>(<span class="ident">e</span>),
            <span class="ident">Json</span>::<span class="ident">U64</span>(<span class="ident">v</span>) <span class="op">=&gt;</span> <span class="ident">v</span>.<span class="ident">encode</span>(<span class="ident">e</span>),
            <span class="ident">Json</span>::<span class="ident">F64</span>(<span class="ident">v</span>) <span class="op">=&gt;</span> <span class="ident">v</span>.<span class="ident">encode</span>(<span class="ident">e</span>),
            <span class="ident">Json</span>::<span class="ident">String</span>(<span class="kw-2">ref</span> <span class="ident">v</span>) <span class="op">=&gt;</span> <span class="ident">v</span>.<span class="ident">encode</span>(<span class="ident">e</span>),
            <span class="ident">Json</span>::<span class="ident">Boolean</span>(<span class="ident">v</span>) <span class="op">=&gt;</span> <span class="ident">v</span>.<span class="ident">encode</span>(<span class="ident">e</span>),
            <span class="ident">Json</span>::<span class="ident">Array</span>(<span class="kw-2">ref</span> <span class="ident">v</span>) <span class="op">=&gt;</span> <span class="ident">v</span>.<span class="ident">encode</span>(<span class="ident">e</span>),
            <span class="ident">Json</span>::<span class="ident">Object</span>(<span class="kw-2">ref</span> <span class="ident">v</span>) <span class="op">=&gt;</span> <span class="ident">v</span>.<span class="ident">encode</span>(<span class="ident">e</span>),
            <span class="ident">Json</span>::<span class="ident">Null</span> <span class="op">=&gt;</span> <span class="ident">e</span>.<span class="ident">emit_nil</span>(),
        }
    }
}

<span class="doccomment">/// Create an `AsJson` wrapper which can be used to print a value as JSON</span>
<span class="doccomment">/// on-the-fly via `write!`</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_json</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">Encodable</span><span class="op">&gt;</span>(<span class="ident">t</span>: <span class="kw-2">&amp;</span><span class="ident">T</span>) <span class="op">-&gt;</span> <span class="ident">AsJson</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="ident">AsJson</span> { <span class="ident">inner</span>: <span class="ident">t</span> }
}

<span class="doccomment">/// Create an `AsPrettyJson` wrapper which can be used to print a value as JSON</span>
<span class="doccomment">/// on-the-fly via `write!`</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_pretty_json</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">Encodable</span><span class="op">&gt;</span>(<span class="ident">t</span>: <span class="kw-2">&amp;</span><span class="ident">T</span>) <span class="op">-&gt;</span> <span class="ident">AsPrettyJson</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="ident">AsPrettyJson</span> { <span class="ident">inner</span>: <span class="ident">t</span>, <span class="ident">indent</span>: <span class="prelude-val">None</span> }
}

<span class="kw">impl</span> <span class="ident">Json</span> {
    <span class="doccomment">/// Decodes a json value from an `&amp;mut io::Read`</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_reader</span>(<span class="ident">rdr</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">io</span>::<span class="ident">Read</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="self">Self</span>, <span class="ident">BuilderError</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">contents</span> <span class="op">=</span> {
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
            <span class="macro">try</span><span class="macro">!</span>(<span class="ident">rdr</span>.<span class="ident">read_to_end</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">c</span>));
            <span class="ident">c</span>
        };
        <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">str</span>::<span class="ident">from_utf8</span>(<span class="kw-2">&amp;</span><span class="ident">contents</span>).<span class="ident">ok</span>() {
            <span class="prelude-val">Some</span>(<span class="ident">s</span>) <span class="op">=&gt;</span> <span class="ident">s</span>,
            _       <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">NotUtf8</span>, <span class="number">0</span>, <span class="number">0</span>))
        };
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">builder</span> <span class="op">=</span> <span class="ident">Builder</span>::<span class="ident">new</span>(<span class="ident">s</span>.<span class="ident">chars</span>());
        <span class="ident">builder</span>.<span class="ident">build</span>()
    }

    <span class="doccomment">/// Decodes a json value from a string</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_str</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="self">Self</span>, <span class="ident">BuilderError</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">builder</span> <span class="op">=</span> <span class="ident">Builder</span>::<span class="ident">new</span>(<span class="ident">s</span>.<span class="ident">chars</span>());
        <span class="ident">builder</span>.<span class="ident">build</span>()
    }

    <span class="doccomment">/// Borrow this json object as a pretty object to generate a pretty</span>
    <span class="doccomment">/// representation for it via `Display`.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pretty</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">PrettyJson</span> {
        <span class="ident">PrettyJson</span> { <span class="ident">inner</span>: <span class="self">self</span> }
    }

     <span class="doccomment">/// If the Json value is an Object, returns the value associated with the provided key.</span>
    <span class="doccomment">/// Otherwise, returns None.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">find</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">Json</span><span class="op">&gt;</span>{
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="kw-2">&amp;</span><span class="ident">Json</span>::<span class="ident">Object</span>(<span class="kw-2">ref</span> <span class="ident">map</span>) <span class="op">=&gt;</span> <span class="ident">map</span>.<span class="ident">get</span>(<span class="ident">key</span>),
            _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>
        }
    }

    <span class="doccomment">/// Attempts to get a nested Json Object for each key in `keys`.</span>
    <span class="doccomment">/// If any key is found not to exist, find_path will return None.</span>
    <span class="doccomment">/// Otherwise, it will return the Json value associated with the final key.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">find_path</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>, <span class="ident">keys</span>: <span class="kw-2">&amp;</span>[<span class="kw-2">&amp;</span><span class="ident">str</span>]) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">Json</span><span class="op">&gt;</span>{
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">target</span> <span class="op">=</span> <span class="self">self</span>;
        <span class="kw">for</span> <span class="ident">key</span> <span class="kw">in</span> <span class="ident">keys</span>.<span class="ident">iter</span>() {
            <span class="kw">match</span> <span class="ident">target</span>.<span class="ident">find</span>(<span class="kw-2">*</span><span class="ident">key</span>) {
                <span class="prelude-val">Some</span>(<span class="ident">t</span>) <span class="op">=&gt;</span> { <span class="ident">target</span> <span class="op">=</span> <span class="ident">t</span>; },
                <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">None</span>
            }
        }
        <span class="prelude-val">Some</span>(<span class="ident">target</span>)
    }

    <span class="doccomment">/// If the Json value is an Object, performs a depth-first search until</span>
    <span class="doccomment">/// a value associated with the provided key is found. If no value is found</span>
    <span class="doccomment">/// or the Json value is not an Object, returns None.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">search</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">Json</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="kw-2">&amp;</span><span class="ident">Json</span>::<span class="ident">Object</span>(<span class="kw-2">ref</span> <span class="ident">map</span>) <span class="op">=&gt;</span> {
                <span class="kw">match</span> <span class="ident">map</span>.<span class="ident">get</span>(<span class="ident">key</span>) {
                    <span class="prelude-val">Some</span>(<span class="ident">json_value</span>) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">json_value</span>),
                    <span class="prelude-val">None</span> <span class="op">=&gt;</span> {
                        <span class="kw">for</span> (_, <span class="ident">v</span>) <span class="kw">in</span> <span class="ident">map</span>.<span class="ident">iter</span>() {
                            <span class="kw">match</span> <span class="ident">v</span>.<span class="ident">search</span>(<span class="ident">key</span>) {
                                <span class="ident">x</span> <span class="kw">if</span> <span class="ident">x</span>.<span class="ident">is_some</span>() <span class="op">=&gt;</span> <span class="kw">return</span> <span class="ident">x</span>,
                                _ <span class="op">=&gt;</span> ()
                            }
                        }
                        <span class="prelude-val">None</span>
                    }
                }
            },
            _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>
        }
    }

    <span class="doccomment">/// Returns true if the Json value is an Object. Returns false otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_object</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">as_object</span>().<span class="ident">is_some</span>()
    }

    <span class="doccomment">/// If the Json value is an Object, returns a reference to the associated BTreeMap.</span>
    <span class="doccomment">/// Returns None otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_object</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">Object</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="kw-2">&amp;</span><span class="ident">Json</span>::<span class="ident">Object</span>(<span class="kw-2">ref</span> <span class="ident">map</span>) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">map</span>),
            _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>
        }
    }

    <span class="doccomment">/// If the Json value is an Object, returns a mutable reference to the associated BTreeMap.</span>
    <span class="doccomment">/// Returns None otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_object_mut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">Object</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Json</span>::<span class="ident">Object</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">map</span>) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">map</span>),
            _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>
        }
    }

    <span class="doccomment">/// If the Json value is an Object, returns the associated BTreeMap.</span>
    <span class="doccomment">/// Returns None otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_object</span>(<span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Object</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="ident">Json</span>::<span class="ident">Object</span>(<span class="ident">map</span>) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">map</span>),
            _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>
        }
    }

    <span class="doccomment">/// Returns true if the Json value is an Array. Returns false otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_array</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">as_array</span>().<span class="ident">is_some</span>()
    }

    <span class="doccomment">/// If the Json value is an Array, returns a reference to the associated vector.</span>
    <span class="doccomment">/// Returns None otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_array</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">Array</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="kw-2">&amp;</span><span class="ident">Json</span>::<span class="ident">Array</span>(<span class="kw-2">ref</span> <span class="ident">array</span>) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="ident">array</span>),
            _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>
        }
    }

    <span class="doccomment">/// If the Json value is an Array, returns a mutable reference to the associated vector.</span>
    <span class="doccomment">/// Returns None otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_array_mut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">Array</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Json</span>::<span class="ident">Array</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">list</span>) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">list</span>),
            _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>
        }
    }

    <span class="doccomment">/// If the Json value is an Array, returns the associated vector.</span>
    <span class="doccomment">/// Returns None otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_array</span>(<span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Array</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="ident">Json</span>::<span class="ident">Array</span>(<span class="ident">array</span>) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">array</span>),
            _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>
        }
    }

    <span class="doccomment">/// Returns true if the Json value is a String. Returns false otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_string</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">as_string</span>().<span class="ident">is_some</span>()
    }

    <span class="doccomment">/// If the Json value is a String, returns the associated str.</span>
    <span class="doccomment">/// Returns None otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_string</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">str</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
            <span class="ident">Json</span>::<span class="ident">String</span>(<span class="kw-2">ref</span> <span class="ident">s</span>) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="ident">s</span>),
            _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>
        }
    }

    <span class="doccomment">/// Returns true if the Json value is a Number. Returns false otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_number</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
            <span class="ident">Json</span>::<span class="ident">I64</span>(_) <span class="op">|</span> <span class="ident">Json</span>::<span class="ident">U64</span>(_) <span class="op">|</span> <span class="ident">Json</span>::<span class="ident">F64</span>(_) <span class="op">=&gt;</span> <span class="bool-val">true</span>,
            _ <span class="op">=&gt;</span> <span class="bool-val">false</span>,
        }
    }

    <span class="doccomment">/// Returns true if the Json value is a i64. Returns false otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_i64</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
            <span class="ident">Json</span>::<span class="ident">I64</span>(_) <span class="op">=&gt;</span> <span class="bool-val">true</span>,
            _ <span class="op">=&gt;</span> <span class="bool-val">false</span>,
        }
    }

    <span class="doccomment">/// Returns true if the Json value is a u64. Returns false otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_u64</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
            <span class="ident">Json</span>::<span class="ident">U64</span>(_) <span class="op">=&gt;</span> <span class="bool-val">true</span>,
            _ <span class="op">=&gt;</span> <span class="bool-val">false</span>,
        }
    }

    <span class="doccomment">/// Returns true if the Json value is a f64. Returns false otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_f64</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
            <span class="ident">Json</span>::<span class="ident">F64</span>(_) <span class="op">=&gt;</span> <span class="bool-val">true</span>,
            _ <span class="op">=&gt;</span> <span class="bool-val">false</span>,
        }
    }

    <span class="doccomment">/// If the Json value is a number, return or cast it to a i64.</span>
    <span class="doccomment">/// Returns None otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_i64</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">i64</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
            <span class="ident">Json</span>::<span class="ident">I64</span>(<span class="ident">n</span>) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">n</span>),
            <span class="ident">Json</span>::<span class="ident">U64</span>(<span class="ident">n</span>) <span class="kw">if</span> <span class="ident">n</span> <span class="op">&gt;=</span> <span class="ident">i64</span>::<span class="ident">MAX</span> <span class="kw">as</span> <span class="ident">u64</span> <span class="op">=&gt;</span> <span class="prelude-val">None</span>,
            <span class="ident">Json</span>::<span class="ident">U64</span>(<span class="ident">n</span>) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">n</span> <span class="kw">as</span> <span class="ident">i64</span>),
            _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>
        }
    }

    <span class="doccomment">/// If the Json value is a number, return or cast it to a u64.</span>
    <span class="doccomment">/// Returns None otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_u64</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">u64</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
            <span class="ident">Json</span>::<span class="ident">I64</span>(<span class="ident">n</span>) <span class="kw">if</span> <span class="ident">n</span> <span class="op">&gt;=</span> <span class="number">0</span> <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">n</span> <span class="kw">as</span> <span class="ident">u64</span>),
            <span class="ident">Json</span>::<span class="ident">U64</span>(<span class="ident">n</span>) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">n</span>),
            _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>
        }
    }

    <span class="doccomment">/// If the Json value is a number, return or cast it to a f64.</span>
    <span class="doccomment">/// Returns None otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_f64</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
            <span class="ident">Json</span>::<span class="ident">I64</span>(<span class="ident">n</span>) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">n</span> <span class="kw">as</span> <span class="ident">f64</span>),
            <span class="ident">Json</span>::<span class="ident">U64</span>(<span class="ident">n</span>) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">n</span> <span class="kw">as</span> <span class="ident">f64</span>),
            <span class="ident">Json</span>::<span class="ident">F64</span>(<span class="ident">n</span>) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">n</span>),
            _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>
        }
    }

    <span class="doccomment">/// Returns true if the Json value is a Boolean. Returns false otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_boolean</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">as_boolean</span>().<span class="ident">is_some</span>()
    }

    <span class="doccomment">/// If the Json value is a Boolean, returns the associated bool.</span>
    <span class="doccomment">/// Returns None otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_boolean</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">bool</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="kw-2">&amp;</span><span class="ident">Json</span>::<span class="ident">Boolean</span>(<span class="ident">b</span>) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">b</span>),
            _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>
        }
    }

    <span class="doccomment">/// Returns true if the Json value is a Null. Returns false otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_null</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">as_null</span>().<span class="ident">is_some</span>()
    }

    <span class="doccomment">/// If the Json value is a Null, returns ().</span>
    <span class="doccomment">/// Returns None otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_null</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="kw-2">&amp;</span><span class="ident">Json</span>::<span class="ident">Null</span> <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(()),
            _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>
        }
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">Index</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">str</span><span class="op">&gt;</span>  <span class="kw">for</span> <span class="ident">Json</span> {
    <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Json</span>;

    <span class="kw">fn</span> <span class="ident">index</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">idx</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">Json</span> {
        <span class="self">self</span>.<span class="ident">find</span>(<span class="ident">idx</span>).<span class="ident">unwrap</span>()
    }
}

<span class="kw">impl</span> <span class="ident">Index</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Json</span> {
    <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Json</span>;

    <span class="kw">fn</span> <span class="ident">index</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>, <span class="ident">idx</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">Json</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="kw-2">&amp;</span><span class="ident">Json</span>::<span class="ident">Array</span>(<span class="kw-2">ref</span> <span class="ident">v</span>) <span class="op">=&gt;</span> <span class="kw-2">&amp;</span><span class="ident">v</span>[<span class="ident">idx</span>],
            _ <span class="op">=&gt;</span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;can only index Json with usize if it is an array&quot;</span>)
        }
    }
}

<span class="doccomment">/// The output of the streaming parser.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">JsonEvent</span> {
    <span class="ident">ObjectStart</span>,
    <span class="ident">ObjectEnd</span>,
    <span class="ident">ArrayStart</span>,
    <span class="ident">ArrayEnd</span>,
    <span class="ident">BooleanValue</span>(<span class="ident">bool</span>),
    <span class="ident">I64Value</span>(<span class="ident">i64</span>),
    <span class="ident">U64Value</span>(<span class="ident">u64</span>),
    <span class="ident">F64Value</span>(<span class="ident">f64</span>),
    <span class="ident">StringValue</span>(<span class="ident">string</span>::<span class="ident">String</span>),
    <span class="ident">NullValue</span>,
    <span class="ident">Error</span>(<span class="ident">ParserError</span>),
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">enum</span> <span class="ident">ParserState</span> {
    <span class="comment">// Parse a value in an array, true means first element.</span>
    <span class="ident">ParseArray</span>(<span class="ident">bool</span>),
    <span class="comment">// Parse &#39;,&#39; or &#39;]&#39; after an element in an array.</span>
    <span class="ident">ParseArrayComma</span>,
    <span class="comment">// Parse a key:value in an object, true means first element.</span>
    <span class="ident">ParseObject</span>(<span class="ident">bool</span>),
    <span class="comment">// Parse &#39;,&#39; or &#39;]&#39; after an element in an object.</span>
    <span class="ident">ParseObjectComma</span>,
    <span class="comment">// Initial state.</span>
    <span class="ident">ParseStart</span>,
    <span class="comment">// Expecting the stream to end.</span>
    <span class="ident">ParseBeforeFinish</span>,
    <span class="comment">// Parsing can&#39;t continue.</span>
    <span class="ident">ParseFinished</span>,
}

<span class="doccomment">/// A Stack represents the current position of the parser in the logical</span>
<span class="doccomment">/// structure of the JSON stream.</span>
<span class="doccomment">/// For example foo.bar[3].x</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Stack</span> {
    <span class="ident">stack</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">InternalStackElement</span><span class="op">&gt;</span>,
    <span class="ident">str_buffer</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>,
}

<span class="doccomment">/// StackElements compose a Stack.</span>
<span class="doccomment">/// For example, Key(&quot;foo&quot;), Key(&quot;bar&quot;), Index(3) and Key(&quot;x&quot;) are the</span>
<span class="doccomment">/// StackElements compositing the stack that represents foo.bar[3].x</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>, <span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">StackElement</span><span class="op">&lt;</span><span class="lifetime">&#39;l</span><span class="op">&gt;</span> {
    <span class="ident">Index</span>(<span class="ident">u32</span>),
    <span class="ident">Key</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;l</span> <span class="ident">str</span>),
}

<span class="comment">// Internally, Key elements are stored as indices in a buffer to avoid</span>
<span class="comment">// allocating a string for every member of an object.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>, <span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">enum</span> <span class="ident">InternalStackElement</span> {
    <span class="ident">InternalIndex</span>(<span class="ident">u32</span>),
    <span class="ident">InternalKey</span>(<span class="ident">u16</span>, <span class="ident">u16</span>), <span class="comment">// start, size</span>
}

<span class="kw">impl</span> <span class="ident">Stack</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-&gt;</span> <span class="ident">Stack</span> {
        <span class="ident">Stack</span> { <span class="ident">stack</span>: <span class="ident">Vec</span>::<span class="ident">new</span>(), <span class="ident">str_buffer</span>: <span class="ident">Vec</span>::<span class="ident">new</span>() }
    }

    <span class="doccomment">/// Returns The number of elements in the Stack.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> { <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">len</span>() }

    <span class="doccomment">/// Returns true if the stack is empty.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">is_empty</span>() }

    <span class="doccomment">/// Provides access to the StackElement at a given index.</span>
    <span class="doccomment">/// lower indices are at the bottom of the stack while higher indices are</span>
    <span class="doccomment">/// at the top.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get</span><span class="op">&lt;</span><span class="lifetime">&#39;l</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;l</span> <span class="self">self</span>, <span class="ident">idx</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">StackElement</span><span class="op">&lt;</span><span class="lifetime">&#39;l</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">stack</span>[<span class="ident">idx</span>] {
            <span class="ident">InternalIndex</span>(<span class="ident">i</span>) <span class="op">=&gt;</span> <span class="ident">StackElement</span>::<span class="ident">Index</span>(<span class="ident">i</span>),
            <span class="ident">InternalKey</span>(<span class="ident">start</span>, <span class="ident">size</span>) <span class="op">=&gt;</span> {
                <span class="ident">StackElement</span>::<span class="ident">Key</span>(<span class="ident">str</span>::<span class="ident">from_utf8</span>(
                    <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">str_buffer</span>[<span class="ident">start</span> <span class="kw">as</span> <span class="ident">usize</span> .. <span class="ident">start</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">+</span> <span class="ident">size</span> <span class="kw">as</span> <span class="ident">usize</span>]).<span class="ident">unwrap</span>())
            }
        }
    }

    <span class="doccomment">/// Compares this stack with an array of StackElements.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_equal_to</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">rhs</span>: <span class="kw-2">&amp;</span>[<span class="ident">StackElement</span>]) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">len</span>() <span class="op">!=</span> <span class="ident">rhs</span>.<span class="ident">len</span>() { <span class="kw">return</span> <span class="bool-val">false</span>; }
        <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">rhs</span>.<span class="ident">len</span>() {
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">get</span>(<span class="ident">i</span>) <span class="op">!=</span> <span class="ident">rhs</span>[<span class="ident">i</span>] { <span class="kw">return</span> <span class="bool-val">false</span>; }
        }
        <span class="kw">return</span> <span class="bool-val">true</span>;
    }

    <span class="doccomment">/// Returns true if the bottom-most elements of this stack are the same as</span>
    <span class="doccomment">/// the ones passed as parameter.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">starts_with</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">rhs</span>: <span class="kw-2">&amp;</span>[<span class="ident">StackElement</span>]) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">len</span>() <span class="op">&lt;</span> <span class="ident">rhs</span>.<span class="ident">len</span>() { <span class="kw">return</span> <span class="bool-val">false</span>; }
        <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">rhs</span>.<span class="ident">len</span>() {
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">get</span>(<span class="ident">i</span>) <span class="op">!=</span> <span class="ident">rhs</span>[<span class="ident">i</span>] { <span class="kw">return</span> <span class="bool-val">false</span>; }
        }
        <span class="kw">return</span> <span class="bool-val">true</span>;
    }

    <span class="doccomment">/// Returns true if the top-most elements of this stack are the same as</span>
    <span class="doccomment">/// the ones passed as parameter.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ends_with</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">rhs</span>: <span class="kw-2">&amp;</span>[<span class="ident">StackElement</span>]) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">len</span>() <span class="op">&lt;</span> <span class="ident">rhs</span>.<span class="ident">len</span>() { <span class="kw">return</span> <span class="bool-val">false</span>; }
        <span class="kw">let</span> <span class="ident">offset</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="ident">rhs</span>.<span class="ident">len</span>();
        <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">rhs</span>.<span class="ident">len</span>() {
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">get</span>(<span class="ident">i</span> <span class="op">+</span> <span class="ident">offset</span>) <span class="op">!=</span> <span class="ident">rhs</span>[<span class="ident">i</span>] { <span class="kw">return</span> <span class="bool-val">false</span>; }
        }
        <span class="kw">return</span> <span class="bool-val">true</span>;
    }

    <span class="doccomment">/// Returns the top-most element (if any).</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">top</span><span class="op">&lt;</span><span class="lifetime">&#39;l</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;l</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">StackElement</span><span class="op">&lt;</span><span class="lifetime">&#39;l</span><span class="op">&gt;&gt;</span> {
        <span class="kw">return</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">last</span>() {
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="prelude-val">None</span>,
            <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="ident">InternalIndex</span>(<span class="ident">i</span>)) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">StackElement</span>::<span class="ident">Index</span>(<span class="ident">i</span>)),
            <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="ident">InternalKey</span>(<span class="ident">start</span>, <span class="ident">size</span>)) <span class="op">=&gt;</span> {
                <span class="prelude-val">Some</span>(<span class="ident">StackElement</span>::<span class="ident">Key</span>(<span class="ident">str</span>::<span class="ident">from_utf8</span>(
                    <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">str_buffer</span>[<span class="ident">start</span> <span class="kw">as</span> <span class="ident">usize</span> .. (<span class="ident">start</span><span class="op">+</span><span class="ident">size</span>) <span class="kw">as</span> <span class="ident">usize</span>]
                ).<span class="ident">unwrap</span>()))
            }
        }
    }

    <span class="comment">// Used by Parser to insert Key elements at the top of the stack.</span>
    <span class="kw">fn</span> <span class="ident">push_key</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="ident">string</span>::<span class="ident">String</span>) {
        <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">push</span>(<span class="ident">InternalKey</span>(<span class="self">self</span>.<span class="ident">str_buffer</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">u16</span>, <span class="ident">key</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">u16</span>));
        <span class="kw">for</span> <span class="ident">c</span> <span class="kw">in</span> <span class="ident">key</span>.<span class="ident">as_bytes</span>().<span class="ident">iter</span>() {
            <span class="self">self</span>.<span class="ident">str_buffer</span>.<span class="ident">push</span>(<span class="kw-2">*</span><span class="ident">c</span>);
        }
    }

    <span class="comment">// Used by Parser to insert Index elements at the top of the stack.</span>
    <span class="kw">fn</span> <span class="ident">push_index</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">u32</span>) {
        <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">push</span>(<span class="ident">InternalIndex</span>(<span class="ident">index</span>));
    }

    <span class="comment">// Used by Parser to remove the top-most element of the stack.</span>
    <span class="kw">fn</span> <span class="ident">pop</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="self">self</span>.<span class="ident">is_empty</span>());
        <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">last</span>().<span class="ident">unwrap</span>() {
            <span class="ident">InternalKey</span>(_, <span class="ident">sz</span>) <span class="op">=&gt;</span> {
                <span class="kw">let</span> <span class="ident">new_size</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">str_buffer</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="ident">sz</span> <span class="kw">as</span> <span class="ident">usize</span>;
                <span class="self">self</span>.<span class="ident">str_buffer</span>.<span class="ident">truncate</span>(<span class="ident">new_size</span>);
            }
            <span class="ident">InternalIndex</span>(_) <span class="op">=&gt;</span> {}
        }
        <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">pop</span>();
    }

    <span class="comment">// Used by Parser to test whether the top-most element is an index.</span>
    <span class="kw">fn</span> <span class="ident">last_is_index</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_empty</span>() { <span class="kw">return</span> <span class="bool-val">false</span>; }
        <span class="kw">return</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">last</span>().<span class="ident">unwrap</span>() {
            <span class="ident">InternalIndex</span>(_) <span class="op">=&gt;</span> <span class="bool-val">true</span>,
            _ <span class="op">=&gt;</span> <span class="bool-val">false</span>,
        }
    }

    <span class="comment">// Used by Parser to increment the index of the top-most element.</span>
    <span class="kw">fn</span> <span class="ident">bump_index</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">len</span>();
        <span class="kw">let</span> <span class="ident">idx</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">last</span>().<span class="ident">unwrap</span>() {
            <span class="ident">InternalIndex</span>(<span class="ident">i</span>) <span class="op">=&gt;</span> { <span class="ident">i</span> <span class="op">+</span> <span class="number">1</span> }
            _ <span class="op">=&gt;</span> { <span class="macro">panic</span><span class="macro">!</span>(); }
        };
        <span class="self">self</span>.<span class="ident">stack</span>[<span class="ident">len</span> <span class="op">-</span> <span class="number">1</span>] <span class="op">=</span> <span class="ident">InternalIndex</span>(<span class="ident">idx</span>);
    }
}

<span class="doccomment">/// A streaming JSON parser implemented as an iterator of JsonEvent, consuming</span>
<span class="doccomment">/// an iterator of char.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Parser</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="ident">rdr</span>: <span class="ident">T</span>,
    <span class="ident">ch</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">char</span><span class="op">&gt;</span>,
    <span class="ident">line</span>: <span class="ident">usize</span>,
    <span class="ident">col</span>: <span class="ident">usize</span>,
    <span class="comment">// We maintain a stack representing where we are in the logical structure</span>
    <span class="comment">// of the JSON stream.</span>
    <span class="ident">stack</span>: <span class="ident">Stack</span>,
    <span class="comment">// A state machine is kept to make it possible to interrupt and resume parsing.</span>
    <span class="ident">state</span>: <span class="ident">ParserState</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">Iterator</span><span class="op">&lt;</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">char</span><span class="op">&gt;&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Parser</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">JsonEvent</span>;

    <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">JsonEvent</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">state</span> <span class="op">==</span> <span class="ident">ParseFinished</span> {
            <span class="kw">return</span> <span class="prelude-val">None</span>;
        }

        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">state</span> <span class="op">==</span> <span class="ident">ParseBeforeFinish</span> {
            <span class="self">self</span>.<span class="ident">parse_whitespace</span>();
            <span class="comment">// Make sure there is no trailing characters.</span>
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">eof</span>() {
                <span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="ident">ParseFinished</span>;
                <span class="kw">return</span> <span class="prelude-val">None</span>;
            } <span class="kw">else</span> {
                <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">error_event</span>(<span class="ident">TrailingCharacters</span>));
            }
        }

        <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">parse</span>());
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">Iterator</span><span class="op">&lt;</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">char</span><span class="op">&gt;&gt;</span> <span class="ident">Parser</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="doccomment">/// Creates the JSON parser.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">rdr</span>: <span class="ident">T</span>) <span class="op">-&gt;</span> <span class="ident">Parser</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">Parser</span> {
            <span class="ident">rdr</span>: <span class="ident">rdr</span>,
            <span class="ident">ch</span>: <span class="prelude-val">Some</span>(<span class="string">&#39;\x00&#39;</span>),
            <span class="ident">line</span>: <span class="number">1</span>,
            <span class="ident">col</span>: <span class="number">0</span>,
            <span class="ident">stack</span>: <span class="ident">Stack</span>::<span class="ident">new</span>(),
            <span class="ident">state</span>: <span class="ident">ParseStart</span>,
        };
        <span class="ident">p</span>.<span class="ident">bump</span>();
        <span class="kw">return</span> <span class="ident">p</span>;
    }

    <span class="doccomment">/// Provides access to the current position in the logical structure of the</span>
    <span class="doccomment">/// JSON stream.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">stack</span><span class="op">&lt;</span><span class="lifetime">&#39;l</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;l</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;l</span> <span class="ident">Stack</span> {
        <span class="kw">return</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">stack</span>;
    }

    <span class="kw">fn</span> <span class="ident">eof</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">ch</span>.<span class="ident">is_none</span>() }
    <span class="kw">fn</span> <span class="ident">ch_or_null</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">char</span> { <span class="self">self</span>.<span class="ident">ch</span>.<span class="ident">unwrap_or</span>(<span class="string">&#39;\x00&#39;</span>) }
    <span class="kw">fn</span> <span class="ident">bump</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="self">self</span>.<span class="ident">ch</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">rdr</span>.<span class="ident">next</span>();

        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39;\n&#39;</span>) {
            <span class="self">self</span>.<span class="ident">line</span> <span class="op">+=</span> <span class="number">1</span>;
            <span class="self">self</span>.<span class="ident">col</span> <span class="op">=</span> <span class="number">1</span>;
        } <span class="kw">else</span> {
            <span class="self">self</span>.<span class="ident">col</span> <span class="op">+=</span> <span class="number">1</span>;
        }
    }

    <span class="kw">fn</span> <span class="ident">next_char</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">char</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">bump</span>();
        <span class="self">self</span>.<span class="ident">ch</span>
    }
    <span class="kw">fn</span> <span class="ident">ch_is</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">c</span>: <span class="ident">char</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">ch</span> <span class="op">==</span> <span class="prelude-val">Some</span>(<span class="ident">c</span>)
    }

    <span class="kw">fn</span> <span class="ident">error</span><span class="op">&lt;</span><span class="ident">E</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">reason</span>: <span class="ident">ErrorCode</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">E</span>, <span class="ident">ParserError</span><span class="op">&gt;</span> {
        <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">reason</span>, <span class="self">self</span>.<span class="ident">line</span>, <span class="self">self</span>.<span class="ident">col</span>))
    }

    <span class="kw">fn</span> <span class="ident">parse_whitespace</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="kw">while</span> <span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39; &#39;</span>) <span class="op">||</span>
              <span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39;\n&#39;</span>) <span class="op">||</span>
              <span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39;\t&#39;</span>) <span class="op">||</span>
              <span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39;\r&#39;</span>) { <span class="self">self</span>.<span class="ident">bump</span>(); }
    }

    <span class="kw">fn</span> <span class="ident">parse_number</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">JsonEvent</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">neg</span> <span class="op">=</span> <span class="bool-val">false</span>;

        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39;-&#39;</span>) {
            <span class="self">self</span>.<span class="ident">bump</span>();
            <span class="ident">neg</span> <span class="op">=</span> <span class="bool-val">true</span>;
        }

        <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">parse_u64</span>() {
            <span class="prelude-val">Ok</span>(<span class="ident">res</span>) <span class="op">=&gt;</span> <span class="ident">res</span>,
            <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=&gt;</span> { <span class="kw">return</span> <span class="ident">Error</span>(<span class="ident">e</span>); }
        };

        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39;.&#39;</span>) <span class="op">||</span> <span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39;e&#39;</span>) <span class="op">||</span> <span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39;E&#39;</span>) {
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">res</span> <span class="op">=</span> <span class="ident">res</span> <span class="kw">as</span> <span class="ident">f64</span>;

            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39;.&#39;</span>) {
                <span class="ident">res</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">parse_decimal</span>(<span class="ident">res</span>) {
                    <span class="prelude-val">Ok</span>(<span class="ident">res</span>) <span class="op">=&gt;</span> <span class="ident">res</span>,
                    <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=&gt;</span> { <span class="kw">return</span> <span class="ident">Error</span>(<span class="ident">e</span>); }
                };
            }

            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39;e&#39;</span>) <span class="op">||</span> <span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39;E&#39;</span>) {
                <span class="ident">res</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">parse_exponent</span>(<span class="ident">res</span>) {
                    <span class="prelude-val">Ok</span>(<span class="ident">res</span>) <span class="op">=&gt;</span> <span class="ident">res</span>,
                    <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=&gt;</span> { <span class="kw">return</span> <span class="ident">Error</span>(<span class="ident">e</span>); }
                };
            }

            <span class="kw">if</span> <span class="ident">neg</span> {
                <span class="ident">res</span> <span class="op">*=</span> <span class="op">-</span><span class="number">1.0</span>;
            }

            <span class="ident">F64Value</span>(<span class="ident">res</span>)
        } <span class="kw">else</span> {
            <span class="kw">if</span> <span class="ident">neg</span> {
                <span class="comment">// Make sure we don&#39;t underflow.</span>
                <span class="kw">if</span> <span class="ident">res</span> <span class="op">&gt;</span> (<span class="ident">i64</span>::<span class="ident">MAX</span> <span class="kw">as</span> <span class="ident">u64</span>) <span class="op">+</span> <span class="number">1</span> {
                    <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidNumber</span>, <span class="self">self</span>.<span class="ident">line</span>, <span class="self">self</span>.<span class="ident">col</span>))
                } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">res</span> <span class="op">==</span> <span class="number">0</span> {
                    <span class="ident">I64Value</span>(<span class="ident">res</span> <span class="kw">as</span> <span class="ident">i64</span>)
                } <span class="kw">else</span> {
                    <span class="ident">I64Value</span>((<span class="op">!</span><span class="ident">res</span> <span class="op">+</span> <span class="number">1</span>) <span class="kw">as</span> <span class="ident">i64</span>)
                }
            } <span class="kw">else</span> {
                <span class="ident">U64Value</span>(<span class="ident">res</span>)
            }
        }
    }

    <span class="kw">fn</span> <span class="ident">parse_u64</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">u64</span>, <span class="ident">ParserError</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">accum</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">0</span>;

        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">ch_or_null</span>() {
            <span class="string">&#39;0&#39;</span> <span class="op">=&gt;</span> {
                <span class="self">self</span>.<span class="ident">bump</span>();

                <span class="comment">// A leading &#39;0&#39; must be the only digit before the decimal point.</span>
                <span class="kw">match</span> <span class="self">self</span>.<span class="ident">ch_or_null</span>() {
                    <span class="string">&#39;0&#39;</span> ... <span class="string">&#39;9&#39;</span> <span class="op">=&gt;</span> <span class="kw">return</span> <span class="self">self</span>.<span class="ident">error</span>(<span class="ident">InvalidNumber</span>),
                    _ <span class="op">=&gt;</span> ()
                }
            },
            <span class="string">&#39;1&#39;</span> ... <span class="string">&#39;9&#39;</span> <span class="op">=&gt;</span> {
                <span class="kw">while</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">eof</span>() {
                    <span class="kw">match</span> <span class="self">self</span>.<span class="ident">ch_or_null</span>() {
                        <span class="ident">c</span> @ <span class="string">&#39;0&#39;</span> ... <span class="string">&#39;9&#39;</span> <span class="op">=&gt;</span> {
                            <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">try_or_invalid</span> {
                                (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>: <span class="ident">expr</span>) <span class="op">=&gt;</span> {
                                    <span class="kw">match</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span> {
                                        <span class="prelude-val">Some</span>(<span class="ident">v</span>) <span class="op">=&gt;</span> <span class="ident">v</span>,
                                        <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="kw">return</span> <span class="self">self</span>.<span class="ident">error</span>(<span class="ident">InvalidNumber</span>)
                                    }
                                }
                            }
                            <span class="ident">accum</span> <span class="op">=</span> <span class="macro">try_or_invalid</span><span class="macro">!</span>(<span class="ident">accum</span>.<span class="ident">checked_mul</span>(<span class="number">10</span>));
                            <span class="ident">accum</span> <span class="op">=</span> <span class="macro">try_or_invalid</span><span class="macro">!</span>(<span class="ident">accum</span>.<span class="ident">checked_add</span>((<span class="ident">c</span> <span class="kw">as</span> <span class="ident">u64</span>) <span class="op">-</span> (<span class="string">&#39;0&#39;</span> <span class="kw">as</span> <span class="ident">u64</span>)));

                            <span class="self">self</span>.<span class="ident">bump</span>();
                        }
                        _ <span class="op">=&gt;</span> <span class="kw">break</span>,
                    }
                }
            }
            _ <span class="op">=&gt;</span> <span class="kw">return</span> <span class="self">self</span>.<span class="ident">error</span>(<span class="ident">InvalidNumber</span>),
        }

        <span class="prelude-val">Ok</span>(<span class="ident">accum</span>)
    }

    <span class="kw">fn</span> <span class="ident">parse_decimal</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">res</span>: <span class="ident">f64</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">f64</span>, <span class="ident">ParserError</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">bump</span>();

        <span class="comment">// Make sure a digit follows the decimal place.</span>
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">ch_or_null</span>() {
            <span class="string">&#39;0&#39;</span> ... <span class="string">&#39;9&#39;</span> <span class="op">=&gt;</span> (),
             _ <span class="op">=&gt;</span> <span class="kw">return</span> <span class="self">self</span>.<span class="ident">error</span>(<span class="ident">InvalidNumber</span>)
        }

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">dec</span> <span class="op">=</span> <span class="number">1.0</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">frac</span> <span class="op">=</span> <span class="number">0.0</span>;
        <span class="kw">while</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">eof</span>() {
            <span class="kw">match</span> <span class="self">self</span>.<span class="ident">ch_or_null</span>() {
                <span class="ident">c</span> @ <span class="string">&#39;0&#39;</span> ... <span class="string">&#39;9&#39;</span> <span class="op">=&gt;</span> {
                    <span class="ident">dec</span> <span class="op">/=</span> <span class="number">10.0</span>;
                    <span class="ident">frac</span> <span class="op">+=</span> (((<span class="ident">c</span> <span class="kw">as</span> <span class="ident">isize</span>) <span class="op">-</span> (<span class="string">&#39;0&#39;</span> <span class="kw">as</span> <span class="ident">isize</span>)) <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">*</span> <span class="ident">dec</span>;
                    <span class="self">self</span>.<span class="ident">bump</span>();
                }
                _ <span class="op">=&gt;</span> <span class="kw">break</span>,
            }
        }

        <span class="ident">res</span> <span class="op">+=</span> <span class="ident">frac</span>;

        <span class="prelude-val">Ok</span>(<span class="ident">res</span>)
    }

    <span class="kw">fn</span> <span class="ident">parse_exponent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">res</span>: <span class="ident">f64</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">f64</span>, <span class="ident">ParserError</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">bump</span>();

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">exp</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">neg_exp</span> <span class="op">=</span> <span class="bool-val">false</span>;

        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39;+&#39;</span>) {
            <span class="self">self</span>.<span class="ident">bump</span>();
        } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39;-&#39;</span>) {
            <span class="self">self</span>.<span class="ident">bump</span>();
            <span class="ident">neg_exp</span> <span class="op">=</span> <span class="bool-val">true</span>;
        }

        <span class="comment">// Make sure a digit follows the exponent place.</span>
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">ch_or_null</span>() {
            <span class="string">&#39;0&#39;</span> ... <span class="string">&#39;9&#39;</span> <span class="op">=&gt;</span> (),
            _ <span class="op">=&gt;</span> <span class="kw">return</span> <span class="self">self</span>.<span class="ident">error</span>(<span class="ident">InvalidNumber</span>)
        }
        <span class="kw">while</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">eof</span>() {
            <span class="kw">match</span> <span class="self">self</span>.<span class="ident">ch_or_null</span>() {
                <span class="ident">c</span> @ <span class="string">&#39;0&#39;</span> ... <span class="string">&#39;9&#39;</span> <span class="op">=&gt;</span> {
                    <span class="ident">exp</span> <span class="op">*=</span> <span class="number">10</span>;
                    <span class="ident">exp</span> <span class="op">+=</span> (<span class="ident">c</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op">-</span> (<span class="string">&#39;0&#39;</span> <span class="kw">as</span> <span class="ident">usize</span>);

                    <span class="self">self</span>.<span class="ident">bump</span>();
                }
                _ <span class="op">=&gt;</span> <span class="kw">break</span>
            }
        }

        <span class="kw">let</span> <span class="ident">exp</span> <span class="op">=</span> <span class="number">10_f64</span>.<span class="ident">powi</span>(<span class="ident">exp</span> <span class="kw">as</span> <span class="ident">i32</span>);
        <span class="kw">if</span> <span class="ident">neg_exp</span> {
            <span class="ident">res</span> <span class="op">/=</span> <span class="ident">exp</span>;
        } <span class="kw">else</span> {
            <span class="ident">res</span> <span class="op">*=</span> <span class="ident">exp</span>;
        }

        <span class="prelude-val">Ok</span>(<span class="ident">res</span>)
    }

    <span class="kw">fn</span> <span class="ident">decode_hex_escape</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">u16</span>, <span class="ident">ParserError</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">n</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">while</span> <span class="ident">i</span> <span class="op">&lt;</span> <span class="number">4</span> {
            <span class="self">self</span>.<span class="ident">bump</span>();
            <span class="ident">n</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">ch_or_null</span>() {
                <span class="ident">c</span> @ <span class="string">&#39;0&#39;</span> ... <span class="string">&#39;9&#39;</span> <span class="op">=&gt;</span> <span class="ident">n</span> <span class="op">*</span> <span class="number">16</span> <span class="op">+</span> ((<span class="ident">c</span> <span class="kw">as</span> <span class="ident">u16</span>) <span class="op">-</span> (<span class="string">&#39;0&#39;</span> <span class="kw">as</span> <span class="ident">u16</span>)),
                <span class="ident">c</span> @ <span class="string">&#39;a&#39;</span> ... <span class="string">&#39;f&#39;</span> <span class="op">=&gt;</span> <span class="ident">n</span> <span class="op">*</span> <span class="number">16</span> <span class="op">+</span> (<span class="number">10</span> <span class="op">+</span> (<span class="ident">c</span> <span class="kw">as</span> <span class="ident">u16</span>) <span class="op">-</span> (<span class="string">&#39;a&#39;</span> <span class="kw">as</span> <span class="ident">u16</span>)),
                <span class="ident">c</span> @ <span class="string">&#39;A&#39;</span> ... <span class="string">&#39;F&#39;</span> <span class="op">=&gt;</span> <span class="ident">n</span> <span class="op">*</span> <span class="number">16</span> <span class="op">+</span> (<span class="number">10</span> <span class="op">+</span> (<span class="ident">c</span> <span class="kw">as</span> <span class="ident">u16</span>) <span class="op">-</span> (<span class="string">&#39;A&#39;</span> <span class="kw">as</span> <span class="ident">u16</span>)),
                _ <span class="op">=&gt;</span> <span class="kw">return</span> <span class="self">self</span>.<span class="ident">error</span>(<span class="ident">InvalidEscape</span>)
            };

            <span class="ident">i</span> <span class="op">+=</span> <span class="number">1</span>;
        }

        <span class="prelude-val">Ok</span>(<span class="ident">n</span>)
    }

    <span class="kw">fn</span> <span class="ident">parse_str</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">string</span>::<span class="ident">String</span>, <span class="ident">ParserError</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">escape</span> <span class="op">=</span> <span class="bool-val">false</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">res</span> <span class="op">=</span> <span class="ident">string</span>::<span class="ident">String</span>::<span class="ident">new</span>();

        <span class="kw">loop</span> {
            <span class="self">self</span>.<span class="ident">bump</span>();
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">eof</span>() {
                <span class="kw">return</span> <span class="self">self</span>.<span class="ident">error</span>(<span class="ident">EOFWhileParsingString</span>);
            }

            <span class="kw">if</span> <span class="ident">escape</span> {
                <span class="kw">match</span> <span class="self">self</span>.<span class="ident">ch_or_null</span>() {
                    <span class="string">&#39;&quot;&#39;</span> <span class="op">=&gt;</span> <span class="ident">res</span>.<span class="ident">push</span>(<span class="string">&#39;&quot;&#39;</span>),
                    <span class="string">&#39;\\&#39;</span> <span class="op">=&gt;</span> <span class="ident">res</span>.<span class="ident">push</span>(<span class="string">&#39;\\&#39;</span>),
                    <span class="string">&#39;/&#39;</span> <span class="op">=&gt;</span> <span class="ident">res</span>.<span class="ident">push</span>(<span class="string">&#39;/&#39;</span>),
                    <span class="string">&#39;b&#39;</span> <span class="op">=&gt;</span> <span class="ident">res</span>.<span class="ident">push</span>(<span class="string">&#39;\x08&#39;</span>),
                    <span class="string">&#39;f&#39;</span> <span class="op">=&gt;</span> <span class="ident">res</span>.<span class="ident">push</span>(<span class="string">&#39;\x0c&#39;</span>),
                    <span class="string">&#39;n&#39;</span> <span class="op">=&gt;</span> <span class="ident">res</span>.<span class="ident">push</span>(<span class="string">&#39;\n&#39;</span>),
                    <span class="string">&#39;r&#39;</span> <span class="op">=&gt;</span> <span class="ident">res</span>.<span class="ident">push</span>(<span class="string">&#39;\r&#39;</span>),
                    <span class="string">&#39;t&#39;</span> <span class="op">=&gt;</span> <span class="ident">res</span>.<span class="ident">push</span>(<span class="string">&#39;\t&#39;</span>),
                    <span class="string">&#39;u&#39;</span> <span class="op">=&gt;</span> <span class="kw">match</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">decode_hex_escape</span>()) {
                        <span class="number">0xDC00</span> ... <span class="number">0xDFFF</span> <span class="op">=&gt;</span> {
                            <span class="kw">return</span> <span class="self">self</span>.<span class="ident">error</span>(<span class="ident">LoneLeadingSurrogateInHexEscape</span>)
                        }

                        <span class="comment">// Non-BMP characters are encoded as a sequence of</span>
                        <span class="comment">// two hex escapes, representing UTF-16 surrogates.</span>
                        <span class="ident">n1</span> @ <span class="number">0xD800</span> ... <span class="number">0xDBFF</span> <span class="op">=&gt;</span> {
                            <span class="kw">match</span> (<span class="self">self</span>.<span class="ident">next_char</span>(), <span class="self">self</span>.<span class="ident">next_char</span>()) {
                                (<span class="prelude-val">Some</span>(<span class="string">&#39;\\&#39;</span>), <span class="prelude-val">Some</span>(<span class="string">&#39;u&#39;</span>)) <span class="op">=&gt;</span> (),
                                _ <span class="op">=&gt;</span> <span class="kw">return</span> <span class="self">self</span>.<span class="ident">error</span>(<span class="ident">UnexpectedEndOfHexEscape</span>),
                            }

                            <span class="kw">let</span> <span class="ident">n2</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">decode_hex_escape</span>());
                            <span class="kw">if</span> <span class="ident">n2</span> <span class="op">&lt;</span> <span class="number">0xDC00</span> <span class="op">||</span> <span class="ident">n2</span> <span class="op">&gt;</span> <span class="number">0xDFFF</span> {
                                <span class="kw">return</span> <span class="self">self</span>.<span class="ident">error</span>(<span class="ident">LoneLeadingSurrogateInHexEscape</span>)
                            }
                            <span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> (((<span class="ident">n1</span> <span class="op">-</span> <span class="number">0xD800</span>) <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">&lt;&lt;</span> <span class="number">10</span> <span class="op">|</span>
                                     (<span class="ident">n2</span> <span class="op">-</span> <span class="number">0xDC00</span>) <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">+</span> <span class="number">0x1_0000</span>;
                            <span class="ident">res</span>.<span class="ident">push</span>(<span class="ident">char</span>::<span class="ident">from_u32</span>(<span class="ident">c</span>).<span class="ident">unwrap</span>());
                        }

                        <span class="ident">n</span> <span class="op">=&gt;</span> <span class="kw">match</span> <span class="ident">char</span>::<span class="ident">from_u32</span>(<span class="ident">n</span> <span class="kw">as</span> <span class="ident">u32</span>) {
                            <span class="prelude-val">Some</span>(<span class="ident">c</span>) <span class="op">=&gt;</span> <span class="ident">res</span>.<span class="ident">push</span>(<span class="ident">c</span>),
                            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="kw">return</span> <span class="self">self</span>.<span class="ident">error</span>(<span class="ident">InvalidUnicodeCodePoint</span>),
                        },
                    },
                    _ <span class="op">=&gt;</span> <span class="kw">return</span> <span class="self">self</span>.<span class="ident">error</span>(<span class="ident">InvalidEscape</span>),
                }
                <span class="ident">escape</span> <span class="op">=</span> <span class="bool-val">false</span>;
            } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39;\\&#39;</span>) {
                <span class="ident">escape</span> <span class="op">=</span> <span class="bool-val">true</span>;
            } <span class="kw">else</span> {
                <span class="kw">match</span> <span class="self">self</span>.<span class="ident">ch</span> {
                    <span class="prelude-val">Some</span>(<span class="string">&#39;&quot;&#39;</span>) <span class="op">=&gt;</span> {
                        <span class="self">self</span>.<span class="ident">bump</span>();
                        <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">res</span>);
                    },
                    <span class="prelude-val">Some</span>(<span class="ident">c</span>) <span class="kw">if</span> <span class="ident">c</span> <span class="op">&lt;=</span> <span class="string">&#39;\u{1F}&#39;</span> <span class="op">=&gt;</span>
                        <span class="kw">return</span> <span class="self">self</span>.<span class="ident">error</span>(<span class="ident">ControlCharacterInString</span>),
                    <span class="prelude-val">Some</span>(<span class="ident">c</span>) <span class="op">=&gt;</span> <span class="ident">res</span>.<span class="ident">push</span>(<span class="ident">c</span>),
                    <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="macro">unreachable</span><span class="macro">!</span>()
                }
            }
        }
    }

    <span class="comment">// Invoked at each iteration, consumes the stream until it has enough</span>
    <span class="comment">// information to return a JsonEvent.</span>
    <span class="comment">// Manages an internal state so that parsing can be interrupted and resumed.</span>
    <span class="comment">// Also keeps track of the position in the logical structure of the json</span>
    <span class="comment">// stream int the form of a stack that can be queried by the user using the</span>
    <span class="comment">// stack() method.</span>
    <span class="kw">fn</span> <span class="ident">parse</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">JsonEvent</span> {
        <span class="kw">loop</span> {
            <span class="comment">// The only paths where the loop can spin a new iteration</span>
            <span class="comment">// are in the cases ParseArrayComma and ParseObjectComma if &#39;,&#39;</span>
            <span class="comment">// is parsed. In these cases the state is set to (respectively)</span>
            <span class="comment">// ParseArray(false) and ParseObject(false), which always return,</span>
            <span class="comment">// so there is no risk of getting stuck in an infinite loop.</span>
            <span class="comment">// All other paths return before the end of the loop&#39;s iteration.</span>
            <span class="self">self</span>.<span class="ident">parse_whitespace</span>();

            <span class="kw">match</span> <span class="self">self</span>.<span class="ident">state</span> {
                <span class="ident">ParseStart</span> <span class="op">=&gt;</span> {
                    <span class="kw">return</span> <span class="self">self</span>.<span class="ident">parse_start</span>();
                }
                <span class="ident">ParseArray</span>(<span class="ident">first</span>) <span class="op">=&gt;</span> {
                    <span class="kw">return</span> <span class="self">self</span>.<span class="ident">parse_array</span>(<span class="ident">first</span>);
                }
                <span class="ident">ParseArrayComma</span> <span class="op">=&gt;</span> {
                    <span class="kw">match</span> <span class="self">self</span>.<span class="ident">parse_array_comma_or_end</span>() {
                        <span class="prelude-val">Some</span>(<span class="ident">evt</span>) <span class="op">=&gt;</span> { <span class="kw">return</span> <span class="ident">evt</span>; }
                        <span class="prelude-val">None</span> <span class="op">=&gt;</span> {}
                    }
                }
                <span class="ident">ParseObject</span>(<span class="ident">first</span>) <span class="op">=&gt;</span> {
                    <span class="kw">return</span> <span class="self">self</span>.<span class="ident">parse_object</span>(<span class="ident">first</span>);
                }
                <span class="ident">ParseObjectComma</span> <span class="op">=&gt;</span> {
                    <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">pop</span>();
                    <span class="kw">if</span> <span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39;,&#39;</span>) {
                        <span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="ident">ParseObject</span>(<span class="bool-val">false</span>);
                        <span class="self">self</span>.<span class="ident">bump</span>();
                    } <span class="kw">else</span> {
                        <span class="kw">return</span> <span class="self">self</span>.<span class="ident">parse_object_end</span>();
                    }
                }
                _ <span class="op">=&gt;</span> {
                    <span class="kw">return</span> <span class="self">self</span>.<span class="ident">error_event</span>(<span class="ident">InvalidSyntax</span>);
                }
            }
        }
    }

    <span class="kw">fn</span> <span class="ident">parse_start</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">JsonEvent</span> {
        <span class="kw">let</span> <span class="ident">val</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">parse_value</span>();
        <span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">val</span> {
            <span class="ident">Error</span>(_) <span class="op">=&gt;</span> <span class="ident">ParseFinished</span>,
            <span class="ident">ArrayStart</span> <span class="op">=&gt;</span> <span class="ident">ParseArray</span>(<span class="bool-val">true</span>),
            <span class="ident">ObjectStart</span> <span class="op">=&gt;</span> <span class="ident">ParseObject</span>(<span class="bool-val">true</span>),
            _ <span class="op">=&gt;</span> <span class="ident">ParseBeforeFinish</span>,
        };
        <span class="kw">return</span> <span class="ident">val</span>;
    }

    <span class="kw">fn</span> <span class="ident">parse_array</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">first</span>: <span class="ident">bool</span>) <span class="op">-&gt;</span> <span class="ident">JsonEvent</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39;]&#39;</span>) {
            <span class="kw">if</span> <span class="op">!</span><span class="ident">first</span> {
                <span class="self">self</span>.<span class="ident">error_event</span>(<span class="ident">InvalidSyntax</span>)
            } <span class="kw">else</span> {
                <span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">is_empty</span>() {
                    <span class="ident">ParseBeforeFinish</span>
                } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">last_is_index</span>() {
                    <span class="ident">ParseArrayComma</span>
                } <span class="kw">else</span> {
                    <span class="ident">ParseObjectComma</span>
                };
                <span class="self">self</span>.<span class="ident">bump</span>();
                <span class="ident">ArrayEnd</span>
            }
        } <span class="kw">else</span> {
            <span class="kw">if</span> <span class="ident">first</span> {
                <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">push_index</span>(<span class="number">0</span>);
            }
            <span class="kw">let</span> <span class="ident">val</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">parse_value</span>();
            <span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">val</span> {
                <span class="ident">Error</span>(_) <span class="op">=&gt;</span> <span class="ident">ParseFinished</span>,
                <span class="ident">ArrayStart</span> <span class="op">=&gt;</span> <span class="ident">ParseArray</span>(<span class="bool-val">true</span>),
                <span class="ident">ObjectStart</span> <span class="op">=&gt;</span> <span class="ident">ParseObject</span>(<span class="bool-val">true</span>),
                _ <span class="op">=&gt;</span> <span class="ident">ParseArrayComma</span>,
            };
            <span class="ident">val</span>
        }
    }

    <span class="kw">fn</span> <span class="ident">parse_array_comma_or_end</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">JsonEvent</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39;,&#39;</span>) {
            <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">bump_index</span>();
            <span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="ident">ParseArray</span>(<span class="bool-val">false</span>);
            <span class="self">self</span>.<span class="ident">bump</span>();
            <span class="prelude-val">None</span>
        } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39;]&#39;</span>) {
            <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">pop</span>();
            <span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">is_empty</span>() {
                <span class="ident">ParseBeforeFinish</span>
            } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">last_is_index</span>() {
                <span class="ident">ParseArrayComma</span>
            } <span class="kw">else</span> {
                <span class="ident">ParseObjectComma</span>
            };
            <span class="self">self</span>.<span class="ident">bump</span>();
            <span class="prelude-val">Some</span>(<span class="ident">ArrayEnd</span>)
        } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">eof</span>() {
            <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">error_event</span>(<span class="ident">EOFWhileParsingArray</span>))
        } <span class="kw">else</span> {
            <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">error_event</span>(<span class="ident">InvalidSyntax</span>))
        }
    }

    <span class="kw">fn</span> <span class="ident">parse_object</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">first</span>: <span class="ident">bool</span>) <span class="op">-&gt;</span> <span class="ident">JsonEvent</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39;}&#39;</span>) {
            <span class="kw">if</span> <span class="op">!</span><span class="ident">first</span> {
                <span class="kw">if</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">is_empty</span>() {
                    <span class="kw">return</span> <span class="self">self</span>.<span class="ident">error_event</span>(<span class="ident">TrailingComma</span>);
                } <span class="kw">else</span> {
                    <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">pop</span>();
                }
            }
            <span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">is_empty</span>() {
                <span class="ident">ParseBeforeFinish</span>
            } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">last_is_index</span>() {
                <span class="ident">ParseArrayComma</span>
            } <span class="kw">else</span> {
                <span class="ident">ParseObjectComma</span>
            };
            <span class="self">self</span>.<span class="ident">bump</span>();
            <span class="kw">return</span> <span class="ident">ObjectEnd</span>;
        }
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">eof</span>() {
            <span class="kw">return</span> <span class="self">self</span>.<span class="ident">error_event</span>(<span class="ident">EOFWhileParsingObject</span>);
        }
        <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39;&quot;&#39;</span>) {
            <span class="kw">return</span> <span class="self">self</span>.<span class="ident">error_event</span>(<span class="ident">KeyMustBeAString</span>);
        }
        <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">parse_str</span>() {
            <span class="prelude-val">Ok</span>(<span class="ident">s</span>) <span class="op">=&gt;</span> <span class="ident">s</span>,
            <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=&gt;</span> {
                <span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="ident">ParseFinished</span>;
                <span class="kw">return</span> <span class="ident">Error</span>(<span class="ident">e</span>);
            }
        };
        <span class="self">self</span>.<span class="ident">parse_whitespace</span>();
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">eof</span>() {
            <span class="kw">return</span> <span class="self">self</span>.<span class="ident">error_event</span>(<span class="ident">EOFWhileParsingObject</span>);
        } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">ch_or_null</span>() <span class="op">!=</span> <span class="string">&#39;:&#39;</span> {
            <span class="kw">return</span> <span class="self">self</span>.<span class="ident">error_event</span>(<span class="ident">ExpectedColon</span>);
        }
        <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">push_key</span>(<span class="ident">s</span>);
        <span class="self">self</span>.<span class="ident">bump</span>();
        <span class="self">self</span>.<span class="ident">parse_whitespace</span>();

        <span class="kw">let</span> <span class="ident">val</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">parse_value</span>();

        <span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">val</span> {
            <span class="ident">Error</span>(_) <span class="op">=&gt;</span> <span class="ident">ParseFinished</span>,
            <span class="ident">ArrayStart</span> <span class="op">=&gt;</span> <span class="ident">ParseArray</span>(<span class="bool-val">true</span>),
            <span class="ident">ObjectStart</span> <span class="op">=&gt;</span> <span class="ident">ParseObject</span>(<span class="bool-val">true</span>),
            _ <span class="op">=&gt;</span> <span class="ident">ParseObjectComma</span>,
        };
        <span class="kw">return</span> <span class="ident">val</span>;
    }

    <span class="kw">fn</span> <span class="ident">parse_object_end</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">JsonEvent</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">ch_is</span>(<span class="string">&#39;}&#39;</span>) {
            <span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">is_empty</span>() {
                <span class="ident">ParseBeforeFinish</span>
            } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">last_is_index</span>() {
                <span class="ident">ParseArrayComma</span>
            } <span class="kw">else</span> {
                <span class="ident">ParseObjectComma</span>
            };
            <span class="self">self</span>.<span class="ident">bump</span>();
            <span class="ident">ObjectEnd</span>
        } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">eof</span>() {
            <span class="self">self</span>.<span class="ident">error_event</span>(<span class="ident">EOFWhileParsingObject</span>)
        } <span class="kw">else</span> {
            <span class="self">self</span>.<span class="ident">error_event</span>(<span class="ident">InvalidSyntax</span>)
        }
    }

    <span class="kw">fn</span> <span class="ident">parse_value</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">JsonEvent</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">eof</span>() { <span class="kw">return</span> <span class="self">self</span>.<span class="ident">error_event</span>(<span class="ident">EOFWhileParsingValue</span>); }
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">ch_or_null</span>() {
            <span class="string">&#39;n&#39;</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">parse_ident</span>(<span class="string">&quot;ull&quot;</span>, <span class="ident">NullValue</span>) }
            <span class="string">&#39;t&#39;</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">parse_ident</span>(<span class="string">&quot;rue&quot;</span>, <span class="ident">BooleanValue</span>(<span class="bool-val">true</span>)) }
            <span class="string">&#39;f&#39;</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">parse_ident</span>(<span class="string">&quot;alse&quot;</span>, <span class="ident">BooleanValue</span>(<span class="bool-val">false</span>)) }
            <span class="string">&#39;0&#39;</span> ... <span class="string">&#39;9&#39;</span> <span class="op">|</span> <span class="string">&#39;-&#39;</span> <span class="op">=&gt;</span> <span class="self">self</span>.<span class="ident">parse_number</span>(),
            <span class="string">&#39;&quot;&#39;</span> <span class="op">=&gt;</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">parse_str</span>() {
                <span class="prelude-val">Ok</span>(<span class="ident">s</span>) <span class="op">=&gt;</span> <span class="ident">StringValue</span>(<span class="ident">s</span>),
                <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=&gt;</span> <span class="ident">Error</span>(<span class="ident">e</span>),
            },
            <span class="string">&#39;[&#39;</span> <span class="op">=&gt;</span> {
                <span class="self">self</span>.<span class="ident">bump</span>();
                <span class="ident">ArrayStart</span>
            }
            <span class="string">&#39;{&#39;</span> <span class="op">=&gt;</span> {
                <span class="self">self</span>.<span class="ident">bump</span>();
                <span class="ident">ObjectStart</span>
            }
            _ <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">error_event</span>(<span class="ident">InvalidSyntax</span>) }
        }
    }

    <span class="kw">fn</span> <span class="ident">parse_ident</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">ident</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">value</span>: <span class="ident">JsonEvent</span>) <span class="op">-&gt;</span> <span class="ident">JsonEvent</span> {
        <span class="kw">if</span> <span class="ident">ident</span>.<span class="ident">chars</span>().<span class="ident">all</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="prelude-val">Some</span>(<span class="ident">c</span>) <span class="op">==</span> <span class="self">self</span>.<span class="ident">next_char</span>()) {
            <span class="self">self</span>.<span class="ident">bump</span>();
            <span class="ident">value</span>
        } <span class="kw">else</span> {
            <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>, <span class="self">self</span>.<span class="ident">line</span>, <span class="self">self</span>.<span class="ident">col</span>))
        }
    }

    <span class="kw">fn</span> <span class="ident">error_event</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">reason</span>: <span class="ident">ErrorCode</span>) <span class="op">-&gt;</span> <span class="ident">JsonEvent</span> {
        <span class="self">self</span>.<span class="ident">state</span> <span class="op">=</span> <span class="ident">ParseFinished</span>;
        <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">reason</span>, <span class="self">self</span>.<span class="ident">line</span>, <span class="self">self</span>.<span class="ident">col</span>))
    }
}

<span class="doccomment">/// A Builder consumes a json::Parser to create a generic Json structure.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Builder</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="ident">parser</span>: <span class="ident">Parser</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
    <span class="ident">token</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">JsonEvent</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">Iterator</span><span class="op">&lt;</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">char</span><span class="op">&gt;&gt;</span> <span class="ident">Builder</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="doccomment">/// Create a JSON Builder.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">src</span>: <span class="ident">T</span>) <span class="op">-&gt;</span> <span class="ident">Builder</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
        <span class="ident">Builder</span> { <span class="ident">parser</span>: <span class="ident">Parser</span>::<span class="ident">new</span>(<span class="ident">src</span>), <span class="ident">token</span>: <span class="prelude-val">None</span>, }
    }

    <span class="comment">// Decode a Json value from a Parser.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">build</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Json</span>, <span class="ident">BuilderError</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">bump</span>();
        <span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">build_value</span>();
        <span class="self">self</span>.<span class="ident">bump</span>();
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">token</span>.<span class="ident">take</span>() {
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> {}
            <span class="prelude-val">Some</span>(<span class="ident">Error</span>(<span class="ident">e</span>)) <span class="op">=&gt;</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>); }
            _ <span class="op">=&gt;</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>, <span class="self">self</span>.<span class="ident">parser</span>.<span class="ident">line</span>, <span class="self">self</span>.<span class="ident">parser</span>.<span class="ident">col</span>)); }
        }
        <span class="ident">result</span>
    }

    <span class="kw">fn</span> <span class="ident">bump</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="self">self</span>.<span class="ident">token</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">parser</span>.<span class="ident">next</span>();
    }

    <span class="kw">fn</span> <span class="ident">build_value</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Json</span>, <span class="ident">BuilderError</span><span class="op">&gt;</span> {
        <span class="kw">return</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">token</span>.<span class="ident">take</span>() {
            <span class="prelude-val">Some</span>(<span class="ident">NullValue</span>) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">Json</span>::<span class="ident">Null</span>),
            <span class="prelude-val">Some</span>(<span class="ident">I64Value</span>(<span class="ident">n</span>)) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">Json</span>::<span class="ident">I64</span>(<span class="ident">n</span>)),
            <span class="prelude-val">Some</span>(<span class="ident">U64Value</span>(<span class="ident">n</span>)) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">Json</span>::<span class="ident">U64</span>(<span class="ident">n</span>)),
            <span class="prelude-val">Some</span>(<span class="ident">F64Value</span>(<span class="ident">n</span>)) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">Json</span>::<span class="ident">F64</span>(<span class="ident">n</span>)),
            <span class="prelude-val">Some</span>(<span class="ident">BooleanValue</span>(<span class="ident">b</span>)) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">Json</span>::<span class="ident">Boolean</span>(<span class="ident">b</span>)),
            <span class="prelude-val">Some</span>(<span class="ident">StringValue</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">s</span>)) <span class="op">=&gt;</span> {
                <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">temp</span> <span class="op">=</span> <span class="ident">string</span>::<span class="ident">String</span>::<span class="ident">new</span>();
                <span class="ident">swap</span>(<span class="ident">s</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">temp</span>);
                <span class="prelude-val">Ok</span>(<span class="ident">Json</span>::<span class="ident">String</span>(<span class="ident">temp</span>))
            }
            <span class="prelude-val">Some</span>(<span class="ident">Error</span>(<span class="ident">e</span>)) <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>),
            <span class="prelude-val">Some</span>(<span class="ident">ArrayStart</span>) <span class="op">=&gt;</span> <span class="self">self</span>.<span class="ident">build_array</span>(),
            <span class="prelude-val">Some</span>(<span class="ident">ObjectStart</span>) <span class="op">=&gt;</span> <span class="self">self</span>.<span class="ident">build_object</span>(),
            <span class="prelude-val">Some</span>(<span class="ident">ObjectEnd</span>) <span class="op">=&gt;</span> <span class="self">self</span>.<span class="ident">parser</span>.<span class="ident">error</span>(<span class="ident">InvalidSyntax</span>),
            <span class="prelude-val">Some</span>(<span class="ident">ArrayEnd</span>) <span class="op">=&gt;</span> <span class="self">self</span>.<span class="ident">parser</span>.<span class="ident">error</span>(<span class="ident">InvalidSyntax</span>),
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="self">self</span>.<span class="ident">parser</span>.<span class="ident">error</span>(<span class="ident">EOFWhileParsingValue</span>),
        }
    }

    <span class="kw">fn</span> <span class="ident">build_array</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Json</span>, <span class="ident">BuilderError</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">bump</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">values</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();

        <span class="kw">loop</span> {
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">ArrayEnd</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">token</span> {
                <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">Json</span>::<span class="ident">Array</span>(<span class="ident">values</span>.<span class="ident">into_iter</span>().<span class="ident">collect</span>()));
            }
            <span class="kw">match</span> <span class="self">self</span>.<span class="ident">build_value</span>() {
                <span class="prelude-val">Ok</span>(<span class="ident">v</span>) <span class="op">=&gt;</span> <span class="ident">values</span>.<span class="ident">push</span>(<span class="ident">v</span>),
                <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=&gt;</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>) }
            }
            <span class="self">self</span>.<span class="ident">bump</span>();
        }
    }

    <span class="kw">fn</span> <span class="ident">build_object</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Json</span>, <span class="ident">BuilderError</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">bump</span>();

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">values</span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>();

        <span class="kw">loop</span> {
            <span class="kw">match</span> <span class="self">self</span>.<span class="ident">token</span>.<span class="ident">take</span>() {
                <span class="prelude-val">Some</span>(<span class="ident">ObjectEnd</span>) <span class="op">=&gt;</span> { <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">Json</span>::<span class="ident">Object</span>(<span class="ident">values</span>)); }
                <span class="prelude-val">Some</span>(<span class="ident">Error</span>(<span class="ident">e</span>)) <span class="op">=&gt;</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>); }
                <span class="prelude-val">None</span> <span class="op">=&gt;</span> { <span class="kw">break</span>; }
                <span class="ident">token</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">token</span> <span class="op">=</span> <span class="ident">token</span>; }
            }
            <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">parser</span>.<span class="ident">stack</span>().<span class="ident">top</span>() {
                <span class="prelude-val">Some</span>(<span class="ident">StackElement</span>::<span class="ident">Key</span>(<span class="ident">k</span>)) <span class="op">=&gt;</span> { <span class="ident">k</span>.<span class="ident">to_string</span>() }
                _ <span class="op">=&gt;</span> { <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;invalid state&quot;</span>); }
            };
            <span class="kw">match</span> <span class="self">self</span>.<span class="ident">build_value</span>() {
                <span class="prelude-val">Ok</span>(<span class="ident">value</span>) <span class="op">=&gt;</span> { <span class="ident">values</span>.<span class="ident">insert</span>(<span class="ident">key</span>, <span class="ident">value</span>); }
                <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=&gt;</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>); }
            }
            <span class="self">self</span>.<span class="ident">bump</span>();
        }
        <span class="kw">return</span> <span class="self">self</span>.<span class="ident">parser</span>.<span class="ident">error</span>(<span class="ident">EOFWhileParsingObject</span>);
    }
}

<span class="doccomment">/// A structure to decode JSON to values in rust.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Decoder</span> {
    <span class="ident">stack</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Json</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span> <span class="ident">Decoder</span> {
    <span class="doccomment">/// Creates a new decoder instance for decoding the specified JSON value.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">json</span>: <span class="ident">Json</span>) <span class="op">-&gt;</span> <span class="ident">Decoder</span> {
        <span class="ident">Decoder</span> { <span class="ident">stack</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">json</span>] }
    }
}

<span class="kw">impl</span> <span class="ident">Decoder</span> {
    <span class="kw">fn</span> <span class="ident">pop</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">Json</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">pop</span>() {
            <span class="prelude-val">Some</span>(<span class="ident">s</span>) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">s</span>),
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">EOF</span>),
        }
    }
}

<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">expect</span> {
    (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>:<span class="ident">expr</span>, <span class="ident">Null</span>) <span class="op">=&gt;</span> ({
        <span class="kw">match</span> <span class="macro">try</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>) {
            <span class="ident">Json</span>::<span class="ident">Null</span> <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(()),
            <span class="ident">other</span> <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">ExpectedError</span>(<span class="string">&quot;Null&quot;</span>.<span class="ident">to_string</span>(),
                                       <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">other</span>)))
        }
    });
    (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">ident</span>) <span class="op">=&gt;</span> ({
        <span class="kw">match</span> <span class="macro">try</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>) {
            <span class="ident">Json</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>(<span class="ident">v</span>) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">v</span>),
            <span class="ident">other</span> <span class="op">=&gt;</span> {
                <span class="prelude-val">Err</span>(<span class="ident">ExpectedError</span>(<span class="macro">stringify</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>).<span class="ident">to_string</span>(),
                                  <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">other</span>)))
            }
        }
    })
}

<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">read_primitive</span> {
    (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>:<span class="ident">ident</span>) <span class="op">=&gt;</span> {
        <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_comparisons</span>)]</span>
        <span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span><span class="op">&gt;</span> {
            <span class="kw">match</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">pop</span>()) {
                <span class="ident">Json</span>::<span class="ident">I64</span>(<span class="ident">i</span>) <span class="op">=&gt;</span> {
                    <span class="kw">let</span> <span class="ident">other</span> <span class="op">=</span> <span class="ident">i</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>;
                    <span class="kw">if</span> <span class="ident">i</span> <span class="op">==</span> <span class="ident">other</span> <span class="kw">as</span> <span class="ident">i64</span> <span class="op">&amp;&amp;</span> (<span class="ident">other</span> <span class="op">&gt;</span> <span class="number">0</span>) <span class="op">==</span> (<span class="ident">i</span> <span class="op">&gt;</span> <span class="number">0</span>) {
                        <span class="prelude-val">Ok</span>(<span class="ident">other</span>)
                    } <span class="kw">else</span> {
                        <span class="prelude-val">Err</span>(<span class="ident">ExpectedError</span>(<span class="string">&quot;Number&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">i</span>.<span class="ident">to_string</span>()))
                    }
                }
                <span class="ident">Json</span>::<span class="ident">U64</span>(<span class="ident">u</span>) <span class="op">=&gt;</span> {
                    <span class="kw">let</span> <span class="ident">other</span> <span class="op">=</span> <span class="ident">u</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>;
                    <span class="kw">if</span> <span class="ident">u</span> <span class="op">==</span> <span class="ident">other</span> <span class="kw">as</span> <span class="ident">u64</span> <span class="op">&amp;&amp;</span> <span class="ident">other</span> <span class="op">&gt;=</span> <span class="number">0</span> {
                        <span class="prelude-val">Ok</span>(<span class="ident">other</span>)
                    } <span class="kw">else</span> {
                        <span class="prelude-val">Err</span>(<span class="ident">ExpectedError</span>(<span class="string">&quot;Number&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">u</span>.<span class="ident">to_string</span>()))
                    }
                }
                <span class="ident">Json</span>::<span class="ident">F64</span>(<span class="ident">f</span>) <span class="op">=&gt;</span> {
                    <span class="prelude-val">Err</span>(<span class="ident">ExpectedError</span>(<span class="string">&quot;Integer&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">f</span>.<span class="ident">to_string</span>()))
                }
                <span class="comment">// re: #12967.. a type w/ numeric keys (ie HashMap&lt;usize, V&gt; etc)</span>
                <span class="comment">// is going to have a string here, as per JSON spec.</span>
                <span class="ident">Json</span>::<span class="ident">String</span>(<span class="ident">s</span>) <span class="op">=&gt;</span> <span class="kw">match</span> <span class="ident">s</span>.<span class="ident">parse</span>() {
                    <span class="prelude-val">Ok</span>(<span class="ident">f</span>)  <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">f</span>),
                    <span class="prelude-val">Err</span>(_) <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">ExpectedError</span>(<span class="string">&quot;Number&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">s</span>)),
                },
                <span class="ident">value</span> <span class="op">=&gt;</span> {
                    <span class="prelude-val">Err</span>(<span class="ident">ExpectedError</span>(<span class="string">&quot;Number&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">value</span>.<span class="ident">to_string</span>()))
                }
            }
        }
    }
}

<span class="kw">impl</span> ::<span class="ident">Decoder</span> <span class="kw">for</span> <span class="ident">Decoder</span> {
    <span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">DecoderError</span>;

    <span class="kw">fn</span> <span class="ident">read_nil</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="macro">expect</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">pop</span>(), <span class="ident">Null</span>)
    }

    <span class="macro">read_primitive</span><span class="macro">!</span> { <span class="ident">read_usize</span>, <span class="ident">usize</span> }
    <span class="macro">read_primitive</span><span class="macro">!</span> { <span class="ident">read_u8</span>, <span class="ident">u8</span> }
    <span class="macro">read_primitive</span><span class="macro">!</span> { <span class="ident">read_u16</span>, <span class="ident">u16</span> }
    <span class="macro">read_primitive</span><span class="macro">!</span> { <span class="ident">read_u32</span>, <span class="ident">u32</span> }
    <span class="macro">read_primitive</span><span class="macro">!</span> { <span class="ident">read_u64</span>, <span class="ident">u64</span> }
    <span class="macro">read_primitive</span><span class="macro">!</span> { <span class="ident">read_isize</span>, <span class="ident">isize</span> }
    <span class="macro">read_primitive</span><span class="macro">!</span> { <span class="ident">read_i8</span>, <span class="ident">i8</span> }
    <span class="macro">read_primitive</span><span class="macro">!</span> { <span class="ident">read_i16</span>, <span class="ident">i16</span> }
    <span class="macro">read_primitive</span><span class="macro">!</span> { <span class="ident">read_i32</span>, <span class="ident">i32</span> }
    <span class="macro">read_primitive</span><span class="macro">!</span> { <span class="ident">read_i64</span>, <span class="ident">i64</span> }

    <span class="kw">fn</span> <span class="ident">read_f32</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">f32</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">read_f64</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span> <span class="kw">as</span> <span class="ident">f32</span>)
    }

    <span class="kw">fn</span> <span class="ident">read_f64</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">pop</span>()) {
            <span class="ident">Json</span>::<span class="ident">I64</span>(<span class="ident">f</span>) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">f</span> <span class="kw">as</span> <span class="ident">f64</span>),
            <span class="ident">Json</span>::<span class="ident">U64</span>(<span class="ident">f</span>) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">f</span> <span class="kw">as</span> <span class="ident">f64</span>),
            <span class="ident">Json</span>::<span class="ident">F64</span>(<span class="ident">f</span>) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">f</span>),
            <span class="ident">Json</span>::<span class="ident">String</span>(<span class="ident">s</span>) <span class="op">=&gt;</span> {
                <span class="comment">// re: #12967.. a type w/ numeric keys (ie HashMap&lt;usize, V&gt; etc)</span>
                <span class="comment">// is going to have a string here, as per JSON spec.</span>
                <span class="kw">match</span> <span class="ident">s</span>.<span class="ident">parse</span>() {
                    <span class="prelude-val">Ok</span>(<span class="ident">f</span>)  <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">f</span>),
                    <span class="prelude-val">Err</span>(_) <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">ExpectedError</span>(<span class="string">&quot;Number&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">s</span>)),
                }
            },
            <span class="ident">Json</span>::<span class="ident">Null</span> <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">f64</span>::<span class="ident">NAN</span>),
            <span class="ident">value</span> <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">ExpectedError</span>(<span class="string">&quot;Number&quot;</span>.<span class="ident">to_string</span>(), <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">value</span>)))
        }
    }

    <span class="kw">fn</span> <span class="ident">read_bool</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">bool</span><span class="op">&gt;</span> {
        <span class="macro">expect</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">pop</span>(), <span class="ident">Boolean</span>)
    }

    <span class="kw">fn</span> <span class="ident">read_char</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">char</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">read_str</span>());
        {
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">it</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">chars</span>();
            <span class="kw">match</span> (<span class="ident">it</span>.<span class="ident">next</span>(), <span class="ident">it</span>.<span class="ident">next</span>()) {
                <span class="comment">// exactly one character</span>
                (<span class="prelude-val">Some</span>(<span class="ident">c</span>), <span class="prelude-val">None</span>) <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">c</span>),
                _ <span class="op">=&gt;</span> ()
            }
        }
        <span class="prelude-val">Err</span>(<span class="ident">ExpectedError</span>(<span class="string">&quot;single character string&quot;</span>.<span class="ident">to_string</span>(), <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">s</span>)))
    }

    <span class="kw">fn</span> <span class="ident">read_str</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">string</span>::<span class="ident">String</span><span class="op">&gt;</span> {
        <span class="macro">expect</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">pop</span>(), <span class="ident">String</span>)
    }

    <span class="kw">fn</span> <span class="ident">read_enum</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">_name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Decoder</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
    {
        <span class="ident">f</span>(<span class="self">self</span>)
    }

    <span class="kw">fn</span> <span class="ident">read_enum_variant</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">names</span>: <span class="kw-2">&amp;</span>[<span class="kw-2">&amp;</span><span class="ident">str</span>],
                               <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>
        <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Decoder</span>, <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
    {
        <span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span> <span class="kw">match</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">pop</span>()) {
            <span class="ident">Json</span>::<span class="ident">String</span>(<span class="ident">s</span>) <span class="op">=&gt;</span> <span class="ident">s</span>,
            <span class="ident">Json</span>::<span class="ident">Object</span>(<span class="kw-2">mut</span> <span class="ident">o</span>) <span class="op">=&gt;</span> {
                <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">o</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="string">&quot;variant&quot;</span>.<span class="ident">to_string</span>()) {
                    <span class="prelude-val">Some</span>(<span class="ident">Json</span>::<span class="ident">String</span>(<span class="ident">s</span>)) <span class="op">=&gt;</span> <span class="ident">s</span>,
                    <span class="prelude-val">Some</span>(<span class="ident">val</span>) <span class="op">=&gt;</span> {
                        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ExpectedError</span>(<span class="string">&quot;String&quot;</span>.<span class="ident">to_string</span>(), <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">val</span>)))
                    }
                    <span class="prelude-val">None</span> <span class="op">=&gt;</span> {
                        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">MissingFieldError</span>(<span class="string">&quot;variant&quot;</span>.<span class="ident">to_string</span>()))
                    }
                };
                <span class="kw">match</span> <span class="ident">o</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="string">&quot;fields&quot;</span>.<span class="ident">to_string</span>()) {
                    <span class="prelude-val">Some</span>(<span class="ident">Json</span>::<span class="ident">Array</span>(<span class="ident">l</span>)) <span class="op">=&gt;</span> {
                        <span class="kw">for</span> <span class="ident">field</span> <span class="kw">in</span> <span class="ident">l</span>.<span class="ident">into_iter</span>().<span class="ident">rev</span>() {
                            <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">push</span>(<span class="ident">field</span>);
                        }
                    },
                    <span class="prelude-val">Some</span>(<span class="ident">val</span>) <span class="op">=&gt;</span> {
                        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ExpectedError</span>(<span class="string">&quot;Array&quot;</span>.<span class="ident">to_string</span>(), <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">val</span>)))
                    }
                    <span class="prelude-val">None</span> <span class="op">=&gt;</span> {
                        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">MissingFieldError</span>(<span class="string">&quot;fields&quot;</span>.<span class="ident">to_string</span>()))
                    }
                }
                <span class="ident">n</span>
            }
            <span class="ident">json</span> <span class="op">=&gt;</span> {
                <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ExpectedError</span>(<span class="string">&quot;String or Object&quot;</span>.<span class="ident">to_string</span>(), <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">json</span>)))
            }
        };
        <span class="kw">let</span> <span class="ident">idx</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">names</span>.<span class="ident">iter</span>().<span class="ident">position</span>(<span class="op">|</span><span class="ident">n</span><span class="op">|</span> <span class="kw-2">*</span><span class="ident">n</span> <span class="op">==</span> <span class="ident">name</span>) {
            <span class="prelude-val">Some</span>(<span class="ident">idx</span>) <span class="op">=&gt;</span> <span class="ident">idx</span>,
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">UnknownVariantError</span>(<span class="ident">name</span>))
        };
        <span class="ident">f</span>(<span class="self">self</span>, <span class="ident">idx</span>)
    }

    <span class="kw">fn</span> <span class="ident">read_enum_variant_arg</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">_idx</span>: <span class="ident">usize</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Decoder</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
    {
        <span class="ident">f</span>(<span class="self">self</span>)
    }

    <span class="kw">fn</span> <span class="ident">read_enum_struct_variant</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">names</span>: <span class="kw-2">&amp;</span>[<span class="kw-2">&amp;</span><span class="ident">str</span>], <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Decoder</span>, <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
    {
        <span class="self">self</span>.<span class="ident">read_enum_variant</span>(<span class="ident">names</span>, <span class="ident">f</span>)
    }


    <span class="kw">fn</span> <span class="ident">read_enum_struct_variant_field</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>,
                                         <span class="ident">_name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>,
                                         <span class="ident">idx</span>: <span class="ident">usize</span>,
                                         <span class="ident">f</span>: <span class="ident">F</span>)
                                         <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Decoder</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
    {
        <span class="self">self</span>.<span class="ident">read_enum_variant_arg</span>(<span class="ident">idx</span>, <span class="ident">f</span>)
    }

    <span class="kw">fn</span> <span class="ident">read_struct</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">_name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">_len</span>: <span class="ident">usize</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Decoder</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
    {
        <span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">f</span>(<span class="self">self</span>));
        <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">pop</span>());
        <span class="prelude-val">Ok</span>(<span class="ident">value</span>)
    }

    <span class="kw">fn</span> <span class="ident">read_struct_field</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>,
                               <span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>,
                               <span class="ident">_idx</span>: <span class="ident">usize</span>,
                               <span class="ident">f</span>: <span class="ident">F</span>)
                               <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Decoder</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
    {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">obj</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="macro">expect</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">pop</span>(), <span class="ident">Object</span>));

        <span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">obj</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">name</span>.<span class="ident">to_string</span>()) {
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> {
                <span class="comment">// Add a Null and try to parse it as an Option&lt;_&gt;</span>
                <span class="comment">// to get None as a default value.</span>
                <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">push</span>(<span class="ident">Json</span>::<span class="ident">Null</span>);
                <span class="kw">match</span> <span class="ident">f</span>(<span class="self">self</span>) {
                    <span class="prelude-val">Ok</span>(<span class="ident">x</span>) <span class="op">=&gt;</span> <span class="ident">x</span>,
                    <span class="prelude-val">Err</span>(_) <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">MissingFieldError</span>(<span class="ident">name</span>.<span class="ident">to_string</span>())),
                }
            },
            <span class="prelude-val">Some</span>(<span class="ident">json</span>) <span class="op">=&gt;</span> {
                <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">push</span>(<span class="ident">json</span>);
                <span class="macro">try</span><span class="macro">!</span>(<span class="ident">f</span>(<span class="self">self</span>))
            }
        };
        <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">push</span>(<span class="ident">Json</span>::<span class="ident">Object</span>(<span class="ident">obj</span>));
        <span class="prelude-val">Ok</span>(<span class="ident">value</span>)
    }

    <span class="kw">fn</span> <span class="ident">read_tuple</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">tuple_len</span>: <span class="ident">usize</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Decoder</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
    {
        <span class="self">self</span>.<span class="ident">read_seq</span>(<span class="kw">move</span> <span class="op">|</span><span class="ident">d</span>, <span class="ident">len</span><span class="op">|</span> {
            <span class="kw">if</span> <span class="ident">len</span> <span class="op">==</span> <span class="ident">tuple_len</span> {
                <span class="ident">f</span>(<span class="ident">d</span>)
            } <span class="kw">else</span> {
                <span class="prelude-val">Err</span>(<span class="ident">ExpectedError</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;Tuple{}&quot;</span>, <span class="ident">tuple_len</span>), <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;Tuple{}&quot;</span>, <span class="ident">len</span>)))
            }
        })
    }

    <span class="kw">fn</span> <span class="ident">read_tuple_arg</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">idx</span>: <span class="ident">usize</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Decoder</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
    {
        <span class="self">self</span>.<span class="ident">read_seq_elt</span>(<span class="ident">idx</span>, <span class="ident">f</span>)
    }

    <span class="kw">fn</span> <span class="ident">read_tuple_struct</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>,
                               <span class="ident">_name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>,
                               <span class="ident">len</span>: <span class="ident">usize</span>,
                               <span class="ident">f</span>: <span class="ident">F</span>)
                               <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Decoder</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
    {
        <span class="self">self</span>.<span class="ident">read_tuple</span>(<span class="ident">len</span>, <span class="ident">f</span>)
    }

    <span class="kw">fn</span> <span class="ident">read_tuple_struct_arg</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>,
                                   <span class="ident">idx</span>: <span class="ident">usize</span>,
                                   <span class="ident">f</span>: <span class="ident">F</span>)
                                   <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Decoder</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
    {
        <span class="self">self</span>.<span class="ident">read_tuple_arg</span>(<span class="ident">idx</span>, <span class="ident">f</span>)
    }

    <span class="kw">fn</span> <span class="ident">read_option</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Decoder</span>, <span class="ident">bool</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
    {
        <span class="kw">match</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">pop</span>()) {
            <span class="ident">Json</span>::<span class="ident">Null</span> <span class="op">=&gt;</span> <span class="ident">f</span>(<span class="self">self</span>, <span class="bool-val">false</span>),
            <span class="ident">value</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">push</span>(<span class="ident">value</span>); <span class="ident">f</span>(<span class="self">self</span>, <span class="bool-val">true</span>) }
        }
    }

    <span class="kw">fn</span> <span class="ident">read_seq</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Decoder</span>, <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
    {
        <span class="kw">let</span> <span class="ident">array</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="macro">expect</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">pop</span>(), <span class="ident">Array</span>));
        <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">array</span>.<span class="ident">len</span>();
        <span class="kw">for</span> <span class="ident">v</span> <span class="kw">in</span> <span class="ident">array</span>.<span class="ident">into_iter</span>().<span class="ident">rev</span>() {
            <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">push</span>(<span class="ident">v</span>);
        }
        <span class="ident">f</span>(<span class="self">self</span>, <span class="ident">len</span>)
    }

    <span class="kw">fn</span> <span class="ident">read_seq_elt</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">_idx</span>: <span class="ident">usize</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Decoder</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
    {
        <span class="ident">f</span>(<span class="self">self</span>)
    }

    <span class="kw">fn</span> <span class="ident">read_map</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="kw">where</span>
        <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Decoder</span>, <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
    {
        <span class="kw">let</span> <span class="ident">obj</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="macro">expect</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">pop</span>(), <span class="ident">Object</span>));
        <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">obj</span>.<span class="ident">len</span>();
        <span class="kw">for</span> (<span class="ident">key</span>, <span class="ident">value</span>) <span class="kw">in</span> <span class="ident">obj</span>.<span class="ident">into_iter</span>() {
            <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">push</span>(<span class="ident">value</span>);
            <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">push</span>(<span class="ident">Json</span>::<span class="ident">String</span>(<span class="ident">key</span>));
        }
        <span class="ident">f</span>(<span class="self">self</span>, <span class="ident">len</span>)
    }

    <span class="kw">fn</span> <span class="ident">read_map_elt_key</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">_idx</span>: <span class="ident">usize</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="kw">where</span>
       <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Decoder</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
    {
        <span class="ident">f</span>(<span class="self">self</span>)
    }

    <span class="kw">fn</span> <span class="ident">read_map_elt_val</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">_idx</span>: <span class="ident">usize</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="kw">where</span>
       <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Decoder</span>) <span class="op">-&gt;</span> <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
    {
        <span class="ident">f</span>(<span class="self">self</span>)
    }

    <span class="kw">fn</span> <span class="ident">error</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">err</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="ident">DecoderError</span> {
        <span class="ident">ApplicationError</span>(<span class="ident">err</span>.<span class="ident">to_string</span>())
    }
}

<span class="doccomment">/// A trait for converting values to JSON</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">ToJson</span> {
    <span class="doccomment">/// Converts the value of `self` to an instance of JSON</span>
    <span class="kw">fn</span> <span class="ident">to_json</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Json</span>;
}

<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">to_json_impl_i64</span> {
    ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">ty</span>), <span class="op">+</span>) <span class="op">=&gt;</span> (
        $(<span class="kw">impl</span> <span class="ident">ToJson</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> {
            <span class="kw">fn</span> <span class="ident">to_json</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Json</span> { <span class="ident">Json</span>::<span class="ident">I64</span>(<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">i64</span>) }
        })<span class="op">+</span>
    )
}

<span class="macro">to_json_impl_i64</span><span class="macro">!</span> { <span class="ident">isize</span>, <span class="ident">i8</span>, <span class="ident">i16</span>, <span class="ident">i32</span>, <span class="ident">i64</span> }

<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">to_json_impl_u64</span> {
    ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">ty</span>), <span class="op">+</span>) <span class="op">=&gt;</span> (
        $(<span class="kw">impl</span> <span class="ident">ToJson</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> {
            <span class="kw">fn</span> <span class="ident">to_json</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Json</span> { <span class="ident">Json</span>::<span class="ident">U64</span>(<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u64</span>) }
        })<span class="op">+</span>
    )
}

<span class="macro">to_json_impl_u64</span><span class="macro">!</span> { <span class="ident">usize</span>, <span class="ident">u8</span>, <span class="ident">u16</span>, <span class="ident">u32</span>, <span class="ident">u64</span> }

<span class="kw">impl</span> <span class="ident">ToJson</span> <span class="kw">for</span> <span class="ident">Json</span> {
    <span class="kw">fn</span> <span class="ident">to_json</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Json</span> { <span class="self">self</span>.<span class="ident">clone</span>() }
}

<span class="kw">impl</span> <span class="ident">ToJson</span> <span class="kw">for</span> <span class="ident">f32</span> {
    <span class="kw">fn</span> <span class="ident">to_json</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Json</span> { (<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">f64</span>).<span class="ident">to_json</span>() }
}

<span class="kw">impl</span> <span class="ident">ToJson</span> <span class="kw">for</span> <span class="ident">f64</span> {
    <span class="kw">fn</span> <span class="ident">to_json</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Json</span> {
        <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">num</span>::<span class="ident">FpCategory</span>::{<span class="ident">Nan</span>, <span class="ident">Infinite</span>};

        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">classify</span>() {
            <span class="ident">Nan</span> <span class="op">|</span> <span class="ident">Infinite</span> <span class="op">=&gt;</span> <span class="ident">Json</span>::<span class="ident">Null</span>,
            _                  <span class="op">=&gt;</span> <span class="ident">Json</span>::<span class="ident">F64</span>(<span class="kw-2">*</span><span class="self">self</span>)
        }
    }
}

<span class="kw">impl</span> <span class="ident">ToJson</span> <span class="kw">for</span> () {
    <span class="kw">fn</span> <span class="ident">to_json</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Json</span> { <span class="ident">Json</span>::<span class="ident">Null</span> }
}

<span class="kw">impl</span> <span class="ident">ToJson</span> <span class="kw">for</span> <span class="ident">bool</span> {
    <span class="kw">fn</span> <span class="ident">to_json</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Json</span> { <span class="ident">Json</span>::<span class="ident">Boolean</span>(<span class="kw-2">*</span><span class="self">self</span>) }
}

<span class="kw">impl</span> <span class="ident">ToJson</span> <span class="kw">for</span> <span class="ident">str</span> {
    <span class="kw">fn</span> <span class="ident">to_json</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Json</span> { <span class="ident">Json</span>::<span class="ident">String</span>(<span class="self">self</span>.<span class="ident">to_string</span>()) }
}

<span class="kw">impl</span> <span class="ident">ToJson</span> <span class="kw">for</span> <span class="ident">string</span>::<span class="ident">String</span> {
    <span class="kw">fn</span> <span class="ident">to_json</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Json</span> { <span class="ident">Json</span>::<span class="ident">String</span>((<span class="kw-2">*</span><span class="self">self</span>).<span class="ident">clone</span>()) }
}

<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">tuple_impl</span> {
    <span class="comment">// use variables to indicate the arity of the tuple</span>
    ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tyvar</span>:<span class="ident">ident</span>),<span class="op">*</span> ) <span class="op">=&gt;</span> {
        <span class="comment">// the trailing commas are for the 1 tuple</span>
        <span class="kw">impl</span><span class="op">&lt;</span>
            $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tyvar</span> : <span class="ident">ToJson</span> ),<span class="op">*</span>
            <span class="op">&gt;</span> <span class="ident">ToJson</span> <span class="kw">for</span> ( $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tyvar</span> ),<span class="op">*</span> , ) {

            <span class="attribute">#[<span class="ident">inline</span>]</span>
            <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">non_snake_case</span>)]</span>
            <span class="kw">fn</span> <span class="ident">to_json</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Json</span> {
                <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
                    ($(<span class="kw-2">ref</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tyvar</span>),<span class="kw-2">*</span>,) <span class="op">=&gt;</span> <span class="ident">Json</span>::<span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>[$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tyvar</span>.<span class="ident">to_json</span>()),<span class="kw-2">*</span>])
                }
            }
        }
    }
}

<span class="macro">tuple_impl</span><span class="macro">!</span>{<span class="ident">A</span>}
<span class="macro">tuple_impl</span><span class="macro">!</span>{<span class="ident">A</span>, <span class="ident">B</span>}
<span class="macro">tuple_impl</span><span class="macro">!</span>{<span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>}
<span class="macro">tuple_impl</span><span class="macro">!</span>{<span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>, <span class="ident">D</span>}
<span class="macro">tuple_impl</span><span class="macro">!</span>{<span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>, <span class="ident">D</span>, <span class="ident">E</span>}
<span class="macro">tuple_impl</span><span class="macro">!</span>{<span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>, <span class="ident">D</span>, <span class="ident">E</span>, <span class="ident">F</span>}
<span class="macro">tuple_impl</span><span class="macro">!</span>{<span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>, <span class="ident">D</span>, <span class="ident">E</span>, <span class="ident">F</span>, <span class="ident">G</span>}
<span class="macro">tuple_impl</span><span class="macro">!</span>{<span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>, <span class="ident">D</span>, <span class="ident">E</span>, <span class="ident">F</span>, <span class="ident">G</span>, <span class="ident">H</span>}
<span class="macro">tuple_impl</span><span class="macro">!</span>{<span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>, <span class="ident">D</span>, <span class="ident">E</span>, <span class="ident">F</span>, <span class="ident">G</span>, <span class="ident">H</span>, <span class="ident">I</span>}
<span class="macro">tuple_impl</span><span class="macro">!</span>{<span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>, <span class="ident">D</span>, <span class="ident">E</span>, <span class="ident">F</span>, <span class="ident">G</span>, <span class="ident">H</span>, <span class="ident">I</span>, <span class="ident">J</span>}
<span class="macro">tuple_impl</span><span class="macro">!</span>{<span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>, <span class="ident">D</span>, <span class="ident">E</span>, <span class="ident">F</span>, <span class="ident">G</span>, <span class="ident">H</span>, <span class="ident">I</span>, <span class="ident">J</span>, <span class="ident">K</span>}
<span class="macro">tuple_impl</span><span class="macro">!</span>{<span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>, <span class="ident">D</span>, <span class="ident">E</span>, <span class="ident">F</span>, <span class="ident">G</span>, <span class="ident">H</span>, <span class="ident">I</span>, <span class="ident">J</span>, <span class="ident">K</span>, <span class="ident">L</span>}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">A</span>: <span class="ident">ToJson</span><span class="op">&gt;</span> <span class="ident">ToJson</span> <span class="kw">for</span> [<span class="ident">A</span>] {
    <span class="kw">fn</span> <span class="ident">to_json</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Json</span> { <span class="ident">Json</span>::<span class="ident">Array</span>(<span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">elt</span><span class="op">|</span> <span class="ident">elt</span>.<span class="ident">to_json</span>()).<span class="ident">collect</span>()) }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">A</span>: <span class="ident">ToJson</span><span class="op">&gt;</span> <span class="ident">ToJson</span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">to_json</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Json</span> { <span class="ident">Json</span>::<span class="ident">Array</span>(<span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">elt</span><span class="op">|</span> <span class="ident">elt</span>.<span class="ident">to_json</span>()).<span class="ident">collect</span>()) }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">A</span>: <span class="ident">ToJson</span><span class="op">&gt;</span> <span class="ident">ToJson</span> <span class="kw">for</span> <span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">string</span>::<span class="ident">String</span>, <span class="ident">A</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">to_json</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Json</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>();
        <span class="kw">for</span> (<span class="ident">key</span>, <span class="ident">value</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">iter</span>() {
            <span class="ident">d</span>.<span class="ident">insert</span>((<span class="kw-2">*</span><span class="ident">key</span>).<span class="ident">clone</span>(), <span class="ident">value</span>.<span class="ident">to_json</span>());
        }
        <span class="ident">Json</span>::<span class="ident">Object</span>(<span class="ident">d</span>)
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">A</span>: <span class="ident">ToJson</span><span class="op">&gt;</span> <span class="ident">ToJson</span> <span class="kw">for</span> <span class="ident">HashMap</span><span class="op">&lt;</span><span class="ident">string</span>::<span class="ident">String</span>, <span class="ident">A</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">to_json</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Json</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>();
        <span class="kw">for</span> (<span class="ident">key</span>, <span class="ident">value</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">iter</span>() {
            <span class="ident">d</span>.<span class="ident">insert</span>((<span class="kw-2">*</span><span class="ident">key</span>).<span class="ident">clone</span>(), <span class="ident">value</span>.<span class="ident">to_json</span>());
        }
        <span class="ident">Json</span>::<span class="ident">Object</span>(<span class="ident">d</span>)
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">A</span>:<span class="ident">ToJson</span><span class="op">&gt;</span> <span class="ident">ToJson</span> <span class="kw">for</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">to_json</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Json</span> {
        <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="ident">Json</span>::<span class="ident">Null</span>,
            <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">value</span>) <span class="op">=&gt;</span> <span class="ident">value</span>.<span class="ident">to_json</span>()
        }
    }
}

<span class="kw">struct</span> <span class="ident">FormatShim</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="lifetime">&#39;b</span>: <span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
    <span class="ident">inner</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span><span class="op">&lt;</span><span class="lifetime">&#39;b</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="lifetime">&#39;b</span><span class="op">&gt;</span> <span class="ident">fmt</span>::<span class="ident">Write</span> <span class="kw">for</span> <span class="ident">FormatShim</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="lifetime">&#39;b</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">write_str</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">write_str</span>(<span class="ident">s</span>) {
            <span class="prelude-val">Ok</span>(_) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(()),
            <span class="prelude-val">Err</span>(_) <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">fmt</span>::<span class="ident">Error</span>)
        }
    }
}

<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">Json</span> {
    <span class="doccomment">/// Encodes a json value into a string</span>
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">shim</span> <span class="op">=</span> <span class="ident">FormatShim</span> { <span class="ident">inner</span>: <span class="ident">f</span> };
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">encoder</span> <span class="op">=</span> <span class="ident">Encoder</span>::<span class="ident">new</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">shim</span>);
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">encode</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">encoder</span>) {
            <span class="prelude-val">Ok</span>(_) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(()),
            <span class="prelude-val">Err</span>(_) <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">fmt</span>::<span class="ident">Error</span>)
        }
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">PrettyJson</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
    <span class="doccomment">/// Encodes a json value into a string</span>
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">shim</span> <span class="op">=</span> <span class="ident">FormatShim</span> { <span class="ident">inner</span>: <span class="ident">f</span> };
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">encoder</span> <span class="op">=</span> <span class="ident">Encoder</span>::<span class="ident">new_pretty</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">shim</span>);
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">encode</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">encoder</span>) {
            <span class="prelude-val">Ok</span>(_) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(()),
            <span class="prelude-val">Err</span>(_) <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">fmt</span>::<span class="ident">Error</span>)
        }
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>: <span class="ident">Encodable</span><span class="op">&gt;</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">AsJson</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> {
    <span class="doccomment">/// Encodes a json value into a string</span>
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">shim</span> <span class="op">=</span> <span class="ident">FormatShim</span> { <span class="ident">inner</span>: <span class="ident">f</span> };
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">encoder</span> <span class="op">=</span> <span class="ident">Encoder</span>::<span class="ident">new</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">shim</span>);
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">encode</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">encoder</span>) {
            <span class="prelude-val">Ok</span>(_) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(()),
            <span class="prelude-val">Err</span>(_) <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">fmt</span>::<span class="ident">Error</span>)
        }
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> <span class="ident">AsPrettyJson</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> {
    <span class="doccomment">/// Set the indentation level for the emitted JSON</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">indent</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">indent</span>: <span class="ident">u32</span>) <span class="op">-&gt;</span> <span class="ident">AsPrettyJson</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">indent</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">indent</span>);
        <span class="self">self</span>
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>: <span class="ident">Encodable</span><span class="op">&gt;</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">AsPrettyJson</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> {
    <span class="doccomment">/// Encodes a json value into a string</span>
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">shim</span> <span class="op">=</span> <span class="ident">FormatShim</span> { <span class="ident">inner</span>: <span class="ident">f</span> };
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">encoder</span> <span class="op">=</span> <span class="ident">Encoder</span>::<span class="ident">new_pretty</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">shim</span>);
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">n</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">indent</span> {
            <span class="comment">// unwrap cannot panic for pretty encoders</span>
            <span class="kw">let</span> _ <span class="op">=</span> <span class="ident">encoder</span>.<span class="ident">set_indent</span>(<span class="ident">n</span>);
        }
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">encode</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">encoder</span>) {
            <span class="prelude-val">Ok</span>(_) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(()),
            <span class="prelude-val">Err</span>(_) <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">fmt</span>::<span class="ident">Error</span>)
        }
    }
}

<span class="kw">impl</span> <span class="ident">FromStr</span> <span class="kw">for</span> <span class="ident">Json</span> {
    <span class="kw">type</span> <span class="prelude-val">Err</span> <span class="op">=</span> <span class="ident">ParserError</span>;
    <span class="kw">fn</span> <span class="ident">from_str</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Json</span>, <span class="ident">ParserError</span><span class="op">&gt;</span> {
        <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="ident">s</span>)
    }
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
    <span class="kw">use</span> <span class="self">self</span>::<span class="ident">Animal</span>::<span class="kw-2">*</span>;
    <span class="kw">use</span> {<span class="ident">Encodable</span>, <span class="ident">Decodable</span>};
    <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">Json</span>::<span class="kw-2">*</span>;
    <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">ErrorCode</span>::<span class="kw-2">*</span>;
    <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">ParserError</span>::<span class="kw-2">*</span>;
    <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">DecoderError</span>::<span class="kw-2">*</span>;
    <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">JsonEvent</span>::<span class="kw-2">*</span>;
    <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">StackElement</span>::<span class="kw-2">*</span>;
    <span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">Json</span>, <span class="ident">DecodeResult</span>, <span class="ident">DecoderError</span>, <span class="ident">JsonEvent</span>, <span class="ident">Parser</span>,
                <span class="ident">StackElement</span>, <span class="ident">Stack</span>, <span class="ident">Decoder</span>, <span class="ident">Encoder</span>, <span class="ident">EncoderError</span>};
    <span class="kw">use</span> <span class="ident">std</span>::{<span class="ident">i64</span>, <span class="ident">u64</span>, <span class="ident">f32</span>, <span class="ident">f64</span>};
    <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">BTreeMap</span>;
    <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">string</span>;

    <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">RustcDecodable</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>, <span class="ident">Debug</span>)]</span>
    <span class="kw">struct</span> <span class="ident">OptionData</span> {
        <span class="ident">opt</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>,
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_decode_option_none</span>() {
        <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span><span class="string">&quot;{}&quot;</span>;
        <span class="kw">let</span> <span class="ident">obj</span>: <span class="ident">OptionData</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="ident">s</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">obj</span>, <span class="ident">OptionData</span> { <span class="ident">opt</span>: <span class="prelude-val">None</span> });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_decode_option_some</span>() {
        <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;{ \&quot;opt\&quot;: 10 }&quot;</span>;
        <span class="kw">let</span> <span class="ident">obj</span>: <span class="ident">OptionData</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="ident">s</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">obj</span>, <span class="ident">OptionData</span> { <span class="ident">opt</span>: <span class="prelude-val">Some</span>(<span class="number">10</span>) });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_decode_option_malformed</span>() {
        <span class="ident">check_err</span>::<span class="op">&lt;</span><span class="ident">OptionData</span><span class="op">&gt;</span>(<span class="string">&quot;{ \&quot;opt\&quot;: [] }&quot;</span>,
                                <span class="ident">ExpectedError</span>(<span class="string">&quot;Number&quot;</span>.<span class="ident">to_string</span>(), <span class="string">&quot;[]&quot;</span>.<span class="ident">to_string</span>()));
        <span class="ident">check_err</span>::<span class="op">&lt;</span><span class="ident">OptionData</span><span class="op">&gt;</span>(<span class="string">&quot;{ \&quot;opt\&quot;: false }&quot;</span>,
                                <span class="ident">ExpectedError</span>(<span class="string">&quot;Number&quot;</span>.<span class="ident">to_string</span>(), <span class="string">&quot;false&quot;</span>.<span class="ident">to_string</span>()));
    }

    <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>, <span class="ident">RustcEncodable</span>, <span class="ident">RustcDecodable</span>, <span class="ident">Debug</span>)]</span>
    <span class="kw">enum</span> <span class="ident">Animal</span> {
        <span class="ident">Dog</span>,
        <span class="ident">Frog</span>(<span class="ident">string</span>::<span class="ident">String</span>, <span class="ident">isize</span>)
    }

    <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>, <span class="ident">RustcEncodable</span>, <span class="ident">RustcDecodable</span>, <span class="ident">Debug</span>)]</span>
    <span class="kw">struct</span> <span class="ident">Inner</span> {
        <span class="ident">a</span>: (),
        <span class="ident">b</span>: <span class="ident">usize</span>,
        <span class="ident">c</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">string</span>::<span class="ident">String</span><span class="op">&gt;</span>,
    }

    <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>, <span class="ident">RustcEncodable</span>, <span class="ident">RustcDecodable</span>, <span class="ident">Debug</span>)]</span>
    <span class="kw">struct</span> <span class="ident">Outer</span> {
        <span class="ident">inner</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Inner</span><span class="op">&gt;</span>,
    }

    <span class="kw">fn</span> <span class="ident">mk_object</span>(<span class="ident">items</span>: <span class="kw-2">&amp;</span>[(<span class="ident">string</span>::<span class="ident">String</span>, <span class="ident">Json</span>)]) <span class="op">-&gt;</span> <span class="ident">Json</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>();

        <span class="kw">for</span> <span class="ident">item</span> <span class="kw">in</span> <span class="ident">items</span>.<span class="ident">iter</span>() {
            <span class="kw">match</span> <span class="kw-2">*</span><span class="ident">item</span> {
                (<span class="kw-2">ref</span> <span class="ident">key</span>, <span class="kw-2">ref</span> <span class="ident">value</span>) <span class="op">=&gt;</span> { <span class="ident">d</span>.<span class="ident">insert</span>((<span class="kw-2">*</span><span class="ident">key</span>).<span class="ident">clone</span>(), (<span class="kw-2">*</span><span class="ident">value</span>).<span class="ident">clone</span>()); },
            }
        };

        <span class="ident">Object</span>(<span class="ident">d</span>)
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_from_str_trait</span>() {
        <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;null&quot;</span>;
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">parse</span>::<span class="op">&lt;</span><span class="ident">Json</span><span class="op">&gt;</span>().<span class="ident">unwrap</span>() <span class="op">==</span> <span class="ident">s</span>.<span class="ident">parse</span>().<span class="ident">unwrap</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_write_null</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Null</span>.<span class="ident">to_string</span>(), <span class="string">&quot;null&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Null</span>.<span class="ident">pretty</span>().<span class="ident">to_string</span>(), <span class="string">&quot;null&quot;</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_write_i64</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">U64</span>(<span class="number">0</span>).<span class="ident">to_string</span>(), <span class="string">&quot;0&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">U64</span>(<span class="number">0</span>).<span class="ident">pretty</span>().<span class="ident">to_string</span>(), <span class="string">&quot;0&quot;</span>);

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">U64</span>(<span class="number">1234</span>).<span class="ident">to_string</span>(), <span class="string">&quot;1234&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">U64</span>(<span class="number">1234</span>).<span class="ident">pretty</span>().<span class="ident">to_string</span>(), <span class="string">&quot;1234&quot;</span>);

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">I64</span>(<span class="op">-</span><span class="number">5678</span>).<span class="ident">to_string</span>(), <span class="string">&quot;-5678&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">I64</span>(<span class="op">-</span><span class="number">5678</span>).<span class="ident">pretty</span>().<span class="ident">to_string</span>(), <span class="string">&quot;-5678&quot;</span>);

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">U64</span>(<span class="number">7650007200025252000</span>).<span class="ident">to_string</span>(), <span class="string">&quot;7650007200025252000&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">U64</span>(<span class="number">7650007200025252000</span>).<span class="ident">pretty</span>().<span class="ident">to_string</span>(), <span class="string">&quot;7650007200025252000&quot;</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_write_f64</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">F64</span>(<span class="number">3.0</span>).<span class="ident">to_string</span>(), <span class="string">&quot;3.0&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">F64</span>(<span class="number">3.0</span>).<span class="ident">pretty</span>().<span class="ident">to_string</span>(), <span class="string">&quot;3.0&quot;</span>);

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">F64</span>(<span class="number">3.1</span>).<span class="ident">to_string</span>(), <span class="string">&quot;3.1&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">F64</span>(<span class="number">3.1</span>).<span class="ident">pretty</span>().<span class="ident">to_string</span>(), <span class="string">&quot;3.1&quot;</span>);

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">F64</span>(<span class="op">-</span><span class="number">1.5</span>).<span class="ident">to_string</span>(), <span class="string">&quot;-1.5&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">F64</span>(<span class="op">-</span><span class="number">1.5</span>).<span class="ident">pretty</span>().<span class="ident">to_string</span>(), <span class="string">&quot;-1.5&quot;</span>);

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">F64</span>(<span class="number">0.5</span>).<span class="ident">to_string</span>(), <span class="string">&quot;0.5&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">F64</span>(<span class="number">0.5</span>).<span class="ident">pretty</span>().<span class="ident">to_string</span>(), <span class="string">&quot;0.5&quot;</span>);

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">F64</span>(<span class="ident">f64</span>::<span class="ident">NAN</span>).<span class="ident">to_string</span>(), <span class="string">&quot;null&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">F64</span>(<span class="ident">f64</span>::<span class="ident">NAN</span>).<span class="ident">pretty</span>().<span class="ident">to_string</span>(), <span class="string">&quot;null&quot;</span>);

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">F64</span>(<span class="ident">f64</span>::<span class="ident">INFINITY</span>).<span class="ident">to_string</span>(), <span class="string">&quot;null&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">F64</span>(<span class="ident">f64</span>::<span class="ident">INFINITY</span>).<span class="ident">pretty</span>().<span class="ident">to_string</span>(), <span class="string">&quot;null&quot;</span>);

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">F64</span>(<span class="ident">f64</span>::<span class="ident">NEG_INFINITY</span>).<span class="ident">to_string</span>(), <span class="string">&quot;null&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">F64</span>(<span class="ident">f64</span>::<span class="ident">NEG_INFINITY</span>).<span class="ident">pretty</span>().<span class="ident">to_string</span>(), <span class="string">&quot;null&quot;</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_write_str</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">String</span>(<span class="string">&quot;&quot;</span>.<span class="ident">to_string</span>()).<span class="ident">to_string</span>(), <span class="string">&quot;\&quot;\&quot;&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">String</span>(<span class="string">&quot;&quot;</span>.<span class="ident">to_string</span>()).<span class="ident">pretty</span>().<span class="ident">to_string</span>(), <span class="string">&quot;\&quot;\&quot;&quot;</span>);

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">String</span>(<span class="string">&quot;homura&quot;</span>.<span class="ident">to_string</span>()).<span class="ident">to_string</span>(), <span class="string">&quot;\&quot;homura\&quot;&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">String</span>(<span class="string">&quot;madoka&quot;</span>.<span class="ident">to_string</span>()).<span class="ident">pretty</span>().<span class="ident">to_string</span>(), <span class="string">&quot;\&quot;madoka\&quot;&quot;</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_write_bool</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Boolean</span>(<span class="bool-val">true</span>).<span class="ident">to_string</span>(), <span class="string">&quot;true&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Boolean</span>(<span class="bool-val">true</span>).<span class="ident">pretty</span>().<span class="ident">to_string</span>(), <span class="string">&quot;true&quot;</span>);

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Boolean</span>(<span class="bool-val">false</span>).<span class="ident">to_string</span>(), <span class="string">&quot;false&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Boolean</span>(<span class="bool-val">false</span>).<span class="ident">pretty</span>().<span class="ident">to_string</span>(), <span class="string">&quot;false&quot;</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_write_array</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>[]).<span class="ident">to_string</span>(), <span class="string">&quot;[]&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>[]).<span class="ident">pretty</span>().<span class="ident">to_string</span>(), <span class="string">&quot;[]&quot;</span>);

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Boolean</span>(<span class="bool-val">true</span>)]).<span class="ident">to_string</span>(), <span class="string">&quot;[true]&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Boolean</span>(<span class="bool-val">true</span>)]).<span class="ident">pretty</span>().<span class="ident">to_string</span>(),
            <span class="string">&quot;\
            [\n  \
                true\n\
            ]&quot;</span>
        );

        <span class="kw">let</span> <span class="ident">long_test_array</span> <span class="op">=</span> <span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>[
            <span class="ident">Boolean</span>(<span class="bool-val">false</span>),
            <span class="ident">Null</span>,
            <span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">String</span>(<span class="string">&quot;foo\nbar&quot;</span>.<span class="ident">to_string</span>()), <span class="ident">F64</span>(<span class="number">3.5</span>)])]);

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">long_test_array</span>.<span class="ident">to_string</span>(),
            <span class="string">&quot;[false,null,[\&quot;foo\\nbar\&quot;,3.5]]&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="ident">long_test_array</span>.<span class="ident">pretty</span>().<span class="ident">to_string</span>(),
            <span class="string">&quot;\
            [\n  \
                false,\n  \
                null,\n  \
                [\n    \
                    \&quot;foo\\nbar\&quot;,\n    \
                    3.5\n  \
                ]\n\
            ]&quot;</span>
        );
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_write_object</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">mk_object</span>(<span class="kw-2">&amp;</span>[]).<span class="ident">to_string</span>(), <span class="string">&quot;{}&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">mk_object</span>(<span class="kw-2">&amp;</span>[]).<span class="ident">pretty</span>().<span class="ident">to_string</span>(), <span class="string">&quot;{}&quot;</span>);

        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="ident">mk_object</span>(<span class="kw-2">&amp;</span>[
                (<span class="string">&quot;a&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">Boolean</span>(<span class="bool-val">true</span>))
            ]).<span class="ident">to_string</span>(),
            <span class="string">&quot;{\&quot;a\&quot;:true}&quot;</span>
        );
        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="ident">mk_object</span>(<span class="kw-2">&amp;</span>[(<span class="string">&quot;a&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">Boolean</span>(<span class="bool-val">true</span>))]).<span class="ident">pretty</span>().<span class="ident">to_string</span>(),
            <span class="string">&quot;\
            {\n  \
                \&quot;a\&quot;: true\n\
            }&quot;</span>
        );

        <span class="kw">let</span> <span class="ident">complex_obj</span> <span class="op">=</span> <span class="ident">mk_object</span>(<span class="kw-2">&amp;</span>[
                (<span class="string">&quot;b&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>[
                    <span class="ident">mk_object</span>(<span class="kw-2">&amp;</span>[(<span class="string">&quot;c&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">String</span>(<span class="string">&quot;\x0c\r&quot;</span>.<span class="ident">to_string</span>()))]),
                    <span class="ident">mk_object</span>(<span class="kw-2">&amp;</span>[(<span class="string">&quot;d&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">String</span>(<span class="string">&quot;&quot;</span>.<span class="ident">to_string</span>()))])
                ]))
            ]);

        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="ident">complex_obj</span>.<span class="ident">to_string</span>(),
            <span class="string">&quot;{\
                \&quot;b\&quot;:[\
                    {\&quot;c\&quot;:\&quot;\\f\\r\&quot;},\
                    {\&quot;d\&quot;:\&quot;\&quot;}\
                ]\
            }&quot;</span>
        );
        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="ident">complex_obj</span>.<span class="ident">pretty</span>().<span class="ident">to_string</span>(),
            <span class="string">&quot;\
            {\n  \
                \&quot;b\&quot;: [\n    \
                    {\n      \
                        \&quot;c\&quot;: \&quot;\\f\\r\&quot;\n    \
                    },\n    \
                    {\n      \
                        \&quot;d\&quot;: \&quot;\&quot;\n    \
                    }\n  \
                ]\n\
            }&quot;</span>
        );

        <span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">mk_object</span>(<span class="kw-2">&amp;</span>[
            (<span class="string">&quot;a&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">Boolean</span>(<span class="bool-val">true</span>)),
            (<span class="string">&quot;b&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>[
                <span class="ident">mk_object</span>(<span class="kw-2">&amp;</span>[(<span class="string">&quot;c&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">String</span>(<span class="string">&quot;\x0c\r&quot;</span>.<span class="ident">to_string</span>()))]),
                <span class="ident">mk_object</span>(<span class="kw-2">&amp;</span>[(<span class="string">&quot;d&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">String</span>(<span class="string">&quot;&quot;</span>.<span class="ident">to_string</span>()))])
            ]))
        ]);

        <span class="comment">// We can&#39;t compare the strings directly because the object fields be</span>
        <span class="comment">// printed in a different order.</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">clone</span>(), <span class="ident">a</span>.<span class="ident">to_string</span>().<span class="ident">parse</span>().<span class="ident">unwrap</span>());
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">clone</span>(), <span class="ident">a</span>.<span class="ident">pretty</span>().<span class="ident">to_string</span>().<span class="ident">parse</span>().<span class="ident">unwrap</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_write_enum</span>() {
        <span class="kw">let</span> <span class="ident">animal</span> <span class="op">=</span> <span class="ident">Dog</span>;
        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}&quot;</span>, <span class="kw">super</span>::<span class="ident">as_json</span>(<span class="kw-2">&amp;</span><span class="ident">animal</span>)),
            <span class="string">&quot;\&quot;Dog\&quot;&quot;</span>
        );
        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}&quot;</span>, <span class="kw">super</span>::<span class="ident">as_pretty_json</span>(<span class="kw-2">&amp;</span><span class="ident">animal</span>)),
            <span class="string">&quot;\&quot;Dog\&quot;&quot;</span>
        );

        <span class="kw">let</span> <span class="ident">animal</span> <span class="op">=</span> <span class="ident">Frog</span>(<span class="string">&quot;Henry&quot;</span>.<span class="ident">to_string</span>(), <span class="number">349</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}&quot;</span>, <span class="kw">super</span>::<span class="ident">as_json</span>(<span class="kw-2">&amp;</span><span class="ident">animal</span>)),
            <span class="string">&quot;{\&quot;variant\&quot;:\&quot;Frog\&quot;,\&quot;fields\&quot;:[\&quot;Henry\&quot;,349]}&quot;</span>
        );
        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}&quot;</span>, <span class="kw">super</span>::<span class="ident">as_pretty_json</span>(<span class="kw-2">&amp;</span><span class="ident">animal</span>)),
            <span class="string">&quot;{\n  \
               \&quot;variant\&quot;: \&quot;Frog\&quot;,\n  \
               \&quot;fields\&quot;: [\n    \
                 \&quot;Henry\&quot;,\n    \
                 349\n  \
               ]\n\
             }&quot;</span>
        );
    }

    <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">check_encoder_for_simple</span> {
        (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">value</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">expected</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> ({
            <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}&quot;</span>, <span class="kw">super</span>::<span class="ident">as_json</span>(<span class="kw-2">&amp;</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">value</span>));
            <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">expected</span>);

            <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}&quot;</span>, <span class="kw">super</span>::<span class="ident">as_pretty_json</span>(<span class="kw-2">&amp;</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">value</span>));
            <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">expected</span>);
        })
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_write_some</span>() {
        <span class="macro">check_encoder_for_simple</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">&quot;jodhpurs&quot;</span>.<span class="ident">to_string</span>()), <span class="string">&quot;\&quot;jodhpurs\&quot;&quot;</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_write_none</span>() {
        <span class="macro">check_encoder_for_simple</span><span class="macro">!</span>(<span class="prelude-val">None</span>::<span class="op">&lt;</span><span class="ident">string</span>::<span class="ident">String</span><span class="op">&gt;</span>, <span class="string">&quot;null&quot;</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_write_char</span>() {
        <span class="macro">check_encoder_for_simple</span><span class="macro">!</span>(<span class="string">&#39;a&#39;</span>, <span class="string">&quot;\&quot;a\&quot;&quot;</span>);
        <span class="macro">check_encoder_for_simple</span><span class="macro">!</span>(<span class="string">&#39;\t&#39;</span>, <span class="string">&quot;\&quot;\\t\&quot;&quot;</span>);
        <span class="macro">check_encoder_for_simple</span><span class="macro">!</span>(<span class="string">&#39;\u{0000}&#39;</span>, <span class="string">&quot;\&quot;\\u0000\&quot;&quot;</span>);
        <span class="macro">check_encoder_for_simple</span><span class="macro">!</span>(<span class="string">&#39;\u{001b}&#39;</span>, <span class="string">&quot;\&quot;\\u001b\&quot;&quot;</span>);
        <span class="macro">check_encoder_for_simple</span><span class="macro">!</span>(<span class="string">&#39;\u{007f}&#39;</span>, <span class="string">&quot;\&quot;\\u007f\&quot;&quot;</span>);
        <span class="macro">check_encoder_for_simple</span><span class="macro">!</span>(<span class="string">&#39;\u{00a0}&#39;</span>, <span class="string">&quot;\&quot;\u{00a0}\&quot;&quot;</span>);
        <span class="macro">check_encoder_for_simple</span><span class="macro">!</span>(<span class="string">&#39;\u{abcd}&#39;</span>, <span class="string">&quot;\&quot;\u{abcd}\&quot;&quot;</span>);
        <span class="macro">check_encoder_for_simple</span><span class="macro">!</span>(<span class="string">&#39;\u{10ffff}&#39;</span>, <span class="string">&quot;\&quot;\u{10ffff}\&quot;&quot;</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_trailing_characters</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;nulla&quot;</span>),  <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">TrailingCharacters</span>, <span class="number">1</span>, <span class="number">5</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;truea&quot;</span>),  <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">TrailingCharacters</span>, <span class="number">1</span>, <span class="number">5</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;falsea&quot;</span>), <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">TrailingCharacters</span>, <span class="number">1</span>, <span class="number">6</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;1a&quot;</span>),     <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">TrailingCharacters</span>, <span class="number">1</span>, <span class="number">2</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;[]a&quot;</span>),    <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">TrailingCharacters</span>, <span class="number">1</span>, <span class="number">3</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{}a&quot;</span>),    <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">TrailingCharacters</span>, <span class="number">1</span>, <span class="number">3</span>)));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_read_identifiers</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;n&quot;</span>),    <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>, <span class="number">1</span>, <span class="number">2</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;nul&quot;</span>),  <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>, <span class="number">1</span>, <span class="number">4</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;t&quot;</span>),    <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>, <span class="number">1</span>, <span class="number">2</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;truz&quot;</span>), <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>, <span class="number">1</span>, <span class="number">4</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;f&quot;</span>),    <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>, <span class="number">1</span>, <span class="number">2</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;faz&quot;</span>),  <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>, <span class="number">1</span>, <span class="number">3</span>)));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;null&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">Null</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;true&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">Boolean</span>(<span class="bool-val">true</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;false&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">Boolean</span>(<span class="bool-val">false</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot; null &quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">Null</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot; true &quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">Boolean</span>(<span class="bool-val">true</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot; false &quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">Boolean</span>(<span class="bool-val">false</span>)));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_decode_identifiers</span>() {
        <span class="kw">let</span> <span class="ident">v</span>: () <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;null&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, ());

        <span class="kw">let</span> <span class="ident">v</span>: <span class="ident">bool</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;true&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="bool-val">true</span>);

        <span class="kw">let</span> <span class="ident">v</span>: <span class="ident">bool</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;false&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="bool-val">false</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_read_number</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;+&quot;</span>),   <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>, <span class="number">1</span>, <span class="number">1</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;.&quot;</span>),   <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>, <span class="number">1</span>, <span class="number">1</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;NaN&quot;</span>), <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>, <span class="number">1</span>, <span class="number">1</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;-&quot;</span>),   <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidNumber</span>, <span class="number">1</span>, <span class="number">2</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;00&quot;</span>),  <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidNumber</span>, <span class="number">1</span>, <span class="number">2</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;1.&quot;</span>),  <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidNumber</span>, <span class="number">1</span>, <span class="number">3</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;1e&quot;</span>),  <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidNumber</span>, <span class="number">1</span>, <span class="number">3</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;1e+&quot;</span>), <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidNumber</span>, <span class="number">1</span>, <span class="number">4</span>)));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;18446744073709551616&quot;</span>), <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidNumber</span>, <span class="number">1</span>, <span class="number">20</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;18446744073709551617&quot;</span>), <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidNumber</span>, <span class="number">1</span>, <span class="number">20</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;-9223372036854775809&quot;</span>), <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidNumber</span>, <span class="number">1</span>, <span class="number">21</span>)));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;3&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">U64</span>(<span class="number">3</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;3.1&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">F64</span>(<span class="number">3.1</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;-1.2&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">F64</span>(<span class="op">-</span><span class="number">1.2</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;0.4&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">F64</span>(<span class="number">0.4</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;0.4e5&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">F64</span>(<span class="number">0.4e5</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;0.4e+15&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">F64</span>(<span class="number">0.4e15</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;0.4e-01&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">F64</span>(<span class="number">0.4e-01</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;123456789.5024&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">F64</span>(<span class="number">123456789.5024</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot; 3 &quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">U64</span>(<span class="number">3</span>)));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;-9223372036854775808&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">I64</span>(<span class="ident">i64</span>::<span class="ident">MIN</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;9223372036854775807&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">U64</span>(<span class="ident">i64</span>::<span class="ident">MAX</span> <span class="kw">as</span> <span class="ident">u64</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;18446744073709551615&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">U64</span>(<span class="ident">u64</span>::<span class="ident">MAX</span>)));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_decode_numbers</span>() {
        <span class="kw">let</span> <span class="ident">v</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;3&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="number">3.0</span>);

        <span class="kw">let</span> <span class="ident">v</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;3.1&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="number">3.1</span>);

        <span class="kw">let</span> <span class="ident">v</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;-1.2&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="op">-</span><span class="number">1.2</span>);

        <span class="kw">let</span> <span class="ident">v</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;0.4&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="number">0.4</span>);

        <span class="kw">let</span> <span class="ident">v</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;0.4e5&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="number">0.4e5</span>);

        <span class="kw">let</span> <span class="ident">v</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;0.4e15&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="number">0.4e15</span>);

        <span class="kw">let</span> <span class="ident">v</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;0.4e-01&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="number">0.4e-01</span>);

        <span class="kw">let</span> <span class="ident">v</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;123456789.5024&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="number">123456789.5024</span>);

        <span class="kw">let</span> <span class="ident">v</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;0&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="number">0</span>);

        <span class="kw">let</span> <span class="ident">v</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;18446744073709551615&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="ident">u64</span>::<span class="ident">MAX</span>);

        <span class="kw">let</span> <span class="ident">v</span>: <span class="ident">i64</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;-9223372036854775808&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="ident">i64</span>::<span class="ident">MIN</span>);

        <span class="kw">let</span> <span class="ident">v</span>: <span class="ident">i64</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;9223372036854775807&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="ident">i64</span>::<span class="ident">MAX</span>);

        <span class="kw">let</span> <span class="ident">res</span>: <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">i64</span><span class="op">&gt;</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;765.25252&quot;</span>);
        <span class="kw">match</span> <span class="ident">res</span> {
            <span class="prelude-val">Ok</span>(..) <span class="op">=&gt;</span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;expected an error&quot;</span>),
            <span class="prelude-val">Err</span>(<span class="ident">ExpectedError</span>(<span class="kw-2">ref</span> <span class="ident">s</span>, _)) <span class="op">=&gt;</span> <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>, <span class="string">&quot;Integer&quot;</span>),
            <span class="prelude-val">Err</span>(..) <span class="op">=&gt;</span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;expected an &#39;expected integer&#39; error&quot;</span>),
        }
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_read_str</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;\&quot;&quot;</span>),     <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingString</span>, <span class="number">1</span>, <span class="number">2</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;\&quot;lol&quot;</span>),  <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingString</span>, <span class="number">1</span>, <span class="number">5</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;\&quot;\n\&quot;&quot;</span>), <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">ControlCharacterInString</span>, <span class="number">2</span>, <span class="number">1</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;\&quot;\0\&quot;&quot;</span>), <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">ControlCharacterInString</span>, <span class="number">1</span>, <span class="number">2</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;\&quot;\u{1}\&quot;&quot;</span>), <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">ControlCharacterInString</span>, <span class="number">1</span>, <span class="number">2</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;\&quot;\u{1F}\&quot;&quot;</span>), <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">ControlCharacterInString</span>, <span class="number">1</span>, <span class="number">2</span>)));

        <span class="comment">// Only C0 control characters are excluded.</span>
        <span class="macro">assert</span><span class="macro">!</span>(<span class="string">&#39;\u{7F}&#39;</span>.<span class="ident">is_control</span>());
        <span class="macro">assert</span><span class="macro">!</span>(<span class="string">&#39;\u{80}&#39;</span>.<span class="ident">is_control</span>());
        <span class="macro">assert</span><span class="macro">!</span>(<span class="string">&#39;\u{9F}&#39;</span>.<span class="ident">is_control</span>());
        <span class="kw">let</span> <span class="ident">c1_controls</span> <span class="op">=</span> <span class="string">&quot;\u{7F}\u{80}\u{9F}&quot;</span>.<span class="ident">to_string</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="kw-2">&amp;</span><span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;\&quot;{}\&quot;&quot;</span>, <span class="ident">c1_controls</span>)), <span class="prelude-val">Ok</span>(<span class="ident">String</span>(<span class="ident">c1_controls</span>)));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;\&quot;\&quot;&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">String</span>(<span class="string">&quot;&quot;</span>.<span class="ident">to_string</span>())));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;\&quot;foo\&quot;&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">String</span>(<span class="string">&quot;foo&quot;</span>.<span class="ident">to_string</span>())));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;\&quot;\\\&quot;\&quot;&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">String</span>(<span class="string">&quot;\&quot;&quot;</span>.<span class="ident">to_string</span>())));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;\&quot;\\b\&quot;&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">String</span>(<span class="string">&quot;\x08&quot;</span>.<span class="ident">to_string</span>())));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;\&quot;\\n\&quot;&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">String</span>(<span class="string">&quot;\n&quot;</span>.<span class="ident">to_string</span>())));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;\&quot;\\r\&quot;&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">String</span>(<span class="string">&quot;\r&quot;</span>.<span class="ident">to_string</span>())));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;\&quot;\\t\&quot;&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">String</span>(<span class="string">&quot;\t&quot;</span>.<span class="ident">to_string</span>())));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot; \&quot;foo\&quot; &quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">String</span>(<span class="string">&quot;foo&quot;</span>.<span class="ident">to_string</span>())));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;\&quot;\\u12ab\&quot;&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">String</span>(<span class="string">&quot;\u{12ab}&quot;</span>.<span class="ident">to_string</span>())));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;\&quot;\\uAB12\&quot;&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">String</span>(<span class="string">&quot;\u{AB12}&quot;</span>.<span class="ident">to_string</span>())));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_decode_str</span>() {
        <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> [(<span class="string">&quot;\&quot;\&quot;&quot;</span>, <span class="string">&quot;&quot;</span>),
                 (<span class="string">&quot;\&quot;foo\&quot;&quot;</span>, <span class="string">&quot;foo&quot;</span>),
                 (<span class="string">&quot;\&quot;\\\&quot;\&quot;&quot;</span>, <span class="string">&quot;\&quot;&quot;</span>),
                 (<span class="string">&quot;\&quot;\\b\&quot;&quot;</span>, <span class="string">&quot;\x08&quot;</span>),
                 (<span class="string">&quot;\&quot;\\n\&quot;&quot;</span>, <span class="string">&quot;\n&quot;</span>),
                 (<span class="string">&quot;\&quot;\\r\&quot;&quot;</span>, <span class="string">&quot;\r&quot;</span>),
                 (<span class="string">&quot;\&quot;\\t\&quot;&quot;</span>, <span class="string">&quot;\t&quot;</span>),
                 (<span class="string">&quot;\&quot;\\u12ab\&quot;&quot;</span>, <span class="string">&quot;\u{12ab}&quot;</span>),
                 (<span class="string">&quot;\&quot;\\uAB12\&quot;&quot;</span>, <span class="string">&quot;\u{AB12}&quot;</span>)];

        <span class="kw">for</span> <span class="kw-2">&amp;</span>(<span class="ident">i</span>, <span class="ident">o</span>) <span class="kw">in</span> <span class="ident">s</span>.<span class="ident">iter</span>() {
            <span class="kw">let</span> <span class="ident">v</span>: <span class="ident">string</span>::<span class="ident">String</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="ident">i</span>).<span class="ident">unwrap</span>();
            <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="ident">o</span>);
        }
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_read_array</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;[&quot;</span>),     <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingValue</span>, <span class="number">1</span>, <span class="number">2</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;[1&quot;</span>),    <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingArray</span>, <span class="number">1</span>, <span class="number">3</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;[1,&quot;</span>),   <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingValue</span>, <span class="number">1</span>, <span class="number">4</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;[1,]&quot;</span>),  <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>,        <span class="number">1</span>, <span class="number">4</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;[6 7]&quot;</span>), <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>,        <span class="number">1</span>, <span class="number">4</span>)));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;[]&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>[])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;[ ]&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>[])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;[true]&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Boolean</span>(<span class="bool-val">true</span>)])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;[ false ]&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Boolean</span>(<span class="bool-val">false</span>)])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;[null]&quot;</span>), <span class="prelude-val">Ok</span>(<span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Null</span>])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;[3, 1]&quot;</span>),
                     <span class="prelude-val">Ok</span>(<span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">U64</span>(<span class="number">3</span>), <span class="ident">U64</span>(<span class="number">1</span>)])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;\n[3, 2]\n&quot;</span>),
                     <span class="prelude-val">Ok</span>(<span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">U64</span>(<span class="number">3</span>), <span class="ident">U64</span>(<span class="number">2</span>)])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;[2, [4, 1]]&quot;</span>),
               <span class="prelude-val">Ok</span>(<span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">U64</span>(<span class="number">2</span>), <span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">U64</span>(<span class="number">4</span>), <span class="ident">U64</span>(<span class="number">1</span>)])])));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_decode_array</span>() {
        <span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span>()<span class="op">&gt;</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;[]&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="macro">vec</span><span class="macro">!</span>[]);

        <span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span>()<span class="op">&gt;</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;[null]&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="macro">vec</span><span class="macro">!</span>[()]);

        <span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">bool</span><span class="op">&gt;</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;[true]&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="bool-val">true</span>]);

        <span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">isize</span><span class="op">&gt;</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;[3, 1]&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="number">3</span>, <span class="number">1</span>]);

        <span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;&gt;</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;[[3], [1, 2]]&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="macro">vec</span><span class="macro">!</span>[<span class="number">3</span>], <span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">2</span>]]);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_decode_tuple</span>() {
        <span class="kw">let</span> <span class="ident">t</span>: (<span class="ident">usize</span>, <span class="ident">usize</span>, <span class="ident">usize</span>) <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;[1, 2, 3]&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">t</span>, (<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>));

        <span class="kw">let</span> <span class="ident">t</span>: (<span class="ident">usize</span>, <span class="ident">string</span>::<span class="ident">String</span>) <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;[1, \&quot;two\&quot;]&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">t</span>, (<span class="number">1</span>, <span class="string">&quot;two&quot;</span>.<span class="ident">to_string</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_decode_tuple_malformed_types</span>() {
        <span class="macro">assert</span><span class="macro">!</span>(<span class="kw">super</span>::<span class="ident">decode</span>::<span class="op">&lt;</span>(<span class="ident">usize</span>, <span class="ident">string</span>::<span class="ident">String</span>)<span class="op">&gt;</span>(<span class="string">&quot;[1, 2]&quot;</span>).<span class="ident">is_err</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_decode_tuple_malformed_length</span>() {
        <span class="macro">assert</span><span class="macro">!</span>(<span class="kw">super</span>::<span class="ident">decode</span>::<span class="op">&lt;</span>(<span class="ident">usize</span>, <span class="ident">usize</span>)<span class="op">&gt;</span>(<span class="string">&quot;[1, 2, 3]&quot;</span>).<span class="ident">is_err</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_read_object</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{&quot;</span>),       <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingObject</span>, <span class="number">1</span>, <span class="number">2</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{ &quot;</span>),      <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingObject</span>, <span class="number">1</span>, <span class="number">3</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{1&quot;</span>),      <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">KeyMustBeAString</span>,      <span class="number">1</span>, <span class="number">2</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{ \&quot;a\&quot;&quot;</span>), <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingObject</span>, <span class="number">1</span>, <span class="number">6</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{\&quot;a\&quot;&quot;</span>),  <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingObject</span>, <span class="number">1</span>, <span class="number">5</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{\&quot;a\&quot; &quot;</span>), <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingObject</span>, <span class="number">1</span>, <span class="number">6</span>)));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{\&quot;a\&quot; 1&quot;</span>),   <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">ExpectedColon</span>,         <span class="number">1</span>, <span class="number">6</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{\&quot;a\&quot;:&quot;</span>),    <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingValue</span>,  <span class="number">1</span>, <span class="number">6</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{\&quot;a\&quot;:1&quot;</span>),   <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingObject</span>, <span class="number">1</span>, <span class="number">7</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{\&quot;a\&quot;:1 1&quot;</span>), <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>,         <span class="number">1</span>, <span class="number">8</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{\&quot;a\&quot;:1,&quot;</span>),  <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingObject</span>, <span class="number">1</span>, <span class="number">8</span>)));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{}&quot;</span>).<span class="ident">unwrap</span>(), <span class="ident">mk_object</span>(<span class="kw-2">&amp;</span>[]));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{\&quot;a\&quot;: 3}&quot;</span>).<span class="ident">unwrap</span>(),
                  <span class="ident">mk_object</span>(<span class="kw-2">&amp;</span>[(<span class="string">&quot;a&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">U64</span>(<span class="number">3</span>))]));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(
                      <span class="string">&quot;{ \&quot;a\&quot;: null, \&quot;b\&quot; : true }&quot;</span>).<span class="ident">unwrap</span>(),
                  <span class="ident">mk_object</span>(<span class="kw-2">&amp;</span>[
                      (<span class="string">&quot;a&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">Null</span>),
                      (<span class="string">&quot;b&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">Boolean</span>(<span class="bool-val">true</span>))]));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;\n{ \&quot;a\&quot;: null, \&quot;b\&quot; : true }\n&quot;</span>).<span class="ident">unwrap</span>(),
                  <span class="ident">mk_object</span>(<span class="kw-2">&amp;</span>[
                      (<span class="string">&quot;a&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">Null</span>),
                      (<span class="string">&quot;b&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">Boolean</span>(<span class="bool-val">true</span>))]));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(
                      <span class="string">&quot;{\&quot;a\&quot; : 1.0 ,\&quot;b\&quot;: [ true ]}&quot;</span>).<span class="ident">unwrap</span>(),
                  <span class="ident">mk_object</span>(<span class="kw-2">&amp;</span>[
                      (<span class="string">&quot;a&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">F64</span>(<span class="number">1.0</span>)),
                      (<span class="string">&quot;b&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Boolean</span>(<span class="bool-val">true</span>)]))
                  ]));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(
                      <span class="string">&quot;{\
                          \&quot;a\&quot;: 1.0, \
                          \&quot;b\&quot;: [\
                              true,\
                              \&quot;foo\\nbar\&quot;, \
                              { \&quot;c\&quot;: {\&quot;d\&quot;: null} } \
                          ]\
                      }&quot;</span>).<span class="ident">unwrap</span>(),
                  <span class="ident">mk_object</span>(<span class="kw-2">&amp;</span>[
                      (<span class="string">&quot;a&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">F64</span>(<span class="number">1.0</span>)),
                      (<span class="string">&quot;b&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>[
                          <span class="ident">Boolean</span>(<span class="bool-val">true</span>),
                          <span class="ident">String</span>(<span class="string">&quot;foo\nbar&quot;</span>.<span class="ident">to_string</span>()),
                          <span class="ident">mk_object</span>(<span class="kw-2">&amp;</span>[
                              (<span class="string">&quot;c&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">mk_object</span>(<span class="kw-2">&amp;</span>[(<span class="string">&quot;d&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">Null</span>)]))
                          ])
                      ]))
                  ]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_decode_struct</span>() {
        <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;{
            \&quot;inner\&quot;: [
                { \&quot;a\&quot;: null, \&quot;b\&quot;: 2, \&quot;c\&quot;: [\&quot;abc\&quot;, \&quot;xyz\&quot;] }
            ]
        }&quot;</span>;

        <span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Outer</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="ident">s</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="ident">v</span>,
            <span class="ident">Outer</span> {
                <span class="ident">inner</span>: <span class="macro">vec</span><span class="macro">!</span>[
                    <span class="ident">Inner</span> { <span class="ident">a</span>: (), <span class="ident">b</span>: <span class="number">2</span>, <span class="ident">c</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;abc&quot;</span>.<span class="ident">to_string</span>(), <span class="string">&quot;xyz&quot;</span>.<span class="ident">to_string</span>()] }
                ]
            }
        );
    }

    <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">RustcDecodable</span>)]</span>
    <span class="kw">struct</span> <span class="ident">FloatStruct</span> {
        <span class="ident">f</span>: <span class="ident">f64</span>,
        <span class="ident">a</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span>
    }
    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_decode_struct_with_nan</span>() {
        <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;{\&quot;f\&quot;:null,\&quot;a\&quot;:[null,123]}&quot;</span>;
        <span class="kw">let</span> <span class="ident">obj</span>: <span class="ident">FloatStruct</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="ident">s</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">obj</span>.<span class="ident">f</span>.<span class="ident">is_nan</span>());
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">obj</span>.<span class="ident">a</span>[<span class="number">0</span>].<span class="ident">is_nan</span>());
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">obj</span>.<span class="ident">a</span>[<span class="number">1</span>], <span class="number">123f64</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_decode_option</span>() {
        <span class="kw">let</span> <span class="ident">value</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">string</span>::<span class="ident">String</span><span class="op">&gt;</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;null&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">value</span>, <span class="prelude-val">None</span>);

        <span class="kw">let</span> <span class="ident">value</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">string</span>::<span class="ident">String</span><span class="op">&gt;</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;\&quot;jodhpurs\&quot;&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">value</span>, <span class="prelude-val">Some</span>(<span class="string">&quot;jodhpurs&quot;</span>.<span class="ident">to_string</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_decode_enum</span>() {
        <span class="kw">let</span> <span class="ident">value</span>: <span class="ident">Animal</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="string">&quot;\&quot;Dog\&quot;&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">value</span>, <span class="ident">Dog</span>);

        <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;{\&quot;variant\&quot;:\&quot;Frog\&quot;,\&quot;fields\&quot;:[\&quot;Henry\&quot;,349]}&quot;</span>;
        <span class="kw">let</span> <span class="ident">value</span>: <span class="ident">Animal</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="ident">s</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">value</span>, <span class="ident">Frog</span>(<span class="string">&quot;Henry&quot;</span>.<span class="ident">to_string</span>(), <span class="number">349</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_decode_result</span>() {
        <span class="kw">let</span> <span class="ident">value</span>: <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">i32</span>, <span class="ident">i8</span><span class="op">&gt;</span> <span class="op">=</span> <span class="prelude-val">Ok</span>(<span class="number">4</span>);
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">encode</span>(<span class="kw-2">&amp;</span><span class="ident">value</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">json_value</span>, <span class="string">&quot;{\&quot;variant\&quot;:\&quot;Ok\&quot;,\&quot;fields\&quot;:[4]}&quot;</span>);
        <span class="kw">let</span> <span class="ident">decoded_value</span>: <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">i32</span>, <span class="ident">i8</span><span class="op">&gt;</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="kw-2">&amp;</span><span class="ident">json_value</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decoded_value</span>, <span class="prelude-val">Ok</span>(<span class="number">4</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_decode_map</span>() {
        <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;{\&quot;a\&quot;: \&quot;Dog\&quot;, \&quot;b\&quot;: {\&quot;variant\&quot;:\&quot;Frog\&quot;,\
                  \&quot;fields\&quot;:[\&quot;Henry\&quot;, 349]}}&quot;</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">map</span>: <span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">string</span>::<span class="ident">String</span>, <span class="ident">Animal</span><span class="op">&gt;</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="ident">s</span>).<span class="ident">unwrap</span>();

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">map</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="string">&quot;a&quot;</span>.<span class="ident">to_string</span>()), <span class="prelude-val">Some</span>(<span class="ident">Dog</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">map</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="string">&quot;b&quot;</span>.<span class="ident">to_string</span>()), <span class="prelude-val">Some</span>(<span class="ident">Frog</span>(<span class="string">&quot;Henry&quot;</span>.<span class="ident">to_string</span>(), <span class="number">349</span>)));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_multiline_errors</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{\n  \&quot;foo\&quot;:\n \&quot;bar\&quot;&quot;</span>),
            <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingObject</span>, <span class="number">3</span>, <span class="number">8</span>)));
    }

    <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">RustcDecodable</span>)]</span>
    <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span>
    <span class="kw">struct</span> <span class="ident">DecodeStruct</span> {
        <span class="ident">x</span>: <span class="ident">f64</span>,
        <span class="ident">y</span>: <span class="ident">bool</span>,
        <span class="ident">z</span>: <span class="ident">string</span>::<span class="ident">String</span>,
        <span class="ident">w</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">DecodeStruct</span><span class="op">&gt;</span>
    }
    <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">RustcDecodable</span>)]</span>
    <span class="kw">enum</span> <span class="ident">DecodeEnum</span> {
        <span class="ident">A</span>(<span class="ident">f64</span>),
        <span class="ident">B</span>(<span class="ident">string</span>::<span class="ident">String</span>)
    }
    <span class="kw">fn</span> <span class="ident">check_err</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">Decodable</span><span class="op">&gt;</span>(<span class="ident">to_parse</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>, <span class="ident">expected</span>: <span class="ident">DecoderError</span>) {
        <span class="kw">let</span> <span class="ident">res</span>: <span class="ident">DecodeResult</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="ident">to_parse</span>) {
            <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">ParseError</span>(<span class="ident">e</span>)),
            <span class="prelude-val">Ok</span>(<span class="ident">json</span>) <span class="op">=&gt;</span> <span class="ident">Decodable</span>::<span class="ident">decode</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Decoder</span>::<span class="ident">new</span>(<span class="ident">json</span>))
        };
        <span class="kw">match</span> <span class="ident">res</span> {
            <span class="prelude-val">Ok</span>(_) <span class="op">=&gt;</span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;`{:?}` parsed &amp; decoded ok, expecting error `{:?}`&quot;</span>,
                              <span class="ident">to_parse</span>, <span class="ident">expected</span>),
            <span class="prelude-val">Err</span>(<span class="ident">ParseError</span>(<span class="ident">e</span>)) <span class="op">=&gt;</span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;`{}` is not valid json: {:?}&quot;</span>,
                                           <span class="ident">to_parse</span>, <span class="ident">e</span>),
            <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=&gt;</span> {
                <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">e</span>, <span class="ident">expected</span>);
            }
        }
    }
    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_decode_errors_struct</span>() {
        <span class="ident">check_err</span>::<span class="op">&lt;</span><span class="ident">DecodeStruct</span><span class="op">&gt;</span>(<span class="string">&quot;[]&quot;</span>, <span class="ident">ExpectedError</span>(<span class="string">&quot;Object&quot;</span>.<span class="ident">to_string</span>(), <span class="string">&quot;[]&quot;</span>.<span class="ident">to_string</span>()));
        <span class="ident">check_err</span>::<span class="op">&lt;</span><span class="ident">DecodeStruct</span><span class="op">&gt;</span>(<span class="string">&quot;{\&quot;x\&quot;: true, \&quot;y\&quot;: true, \&quot;z\&quot;: \&quot;\&quot;, \&quot;w\&quot;: []}&quot;</span>,
                                  <span class="ident">ExpectedError</span>(<span class="string">&quot;Number&quot;</span>.<span class="ident">to_string</span>(), <span class="string">&quot;true&quot;</span>.<span class="ident">to_string</span>()));
        <span class="ident">check_err</span>::<span class="op">&lt;</span><span class="ident">DecodeStruct</span><span class="op">&gt;</span>(<span class="string">&quot;{\&quot;x\&quot;: 1, \&quot;y\&quot;: [], \&quot;z\&quot;: \&quot;\&quot;, \&quot;w\&quot;: []}&quot;</span>,
                                  <span class="ident">ExpectedError</span>(<span class="string">&quot;Boolean&quot;</span>.<span class="ident">to_string</span>(), <span class="string">&quot;[]&quot;</span>.<span class="ident">to_string</span>()));
        <span class="ident">check_err</span>::<span class="op">&lt;</span><span class="ident">DecodeStruct</span><span class="op">&gt;</span>(<span class="string">&quot;{\&quot;x\&quot;: 1, \&quot;y\&quot;: true, \&quot;z\&quot;: {}, \&quot;w\&quot;: []}&quot;</span>,
                                  <span class="ident">ExpectedError</span>(<span class="string">&quot;String&quot;</span>.<span class="ident">to_string</span>(), <span class="string">&quot;{}&quot;</span>.<span class="ident">to_string</span>()));
        <span class="ident">check_err</span>::<span class="op">&lt;</span><span class="ident">DecodeStruct</span><span class="op">&gt;</span>(<span class="string">&quot;{\&quot;x\&quot;: 1, \&quot;y\&quot;: true, \&quot;z\&quot;: \&quot;\&quot;, \&quot;w\&quot;: null}&quot;</span>,
                                  <span class="ident">ExpectedError</span>(<span class="string">&quot;Array&quot;</span>.<span class="ident">to_string</span>(), <span class="string">&quot;null&quot;</span>.<span class="ident">to_string</span>()));
        <span class="ident">check_err</span>::<span class="op">&lt;</span><span class="ident">DecodeStruct</span><span class="op">&gt;</span>(<span class="string">&quot;{\&quot;x\&quot;: 1, \&quot;y\&quot;: true, \&quot;z\&quot;: \&quot;\&quot;}&quot;</span>,
                                  <span class="ident">MissingFieldError</span>(<span class="string">&quot;w&quot;</span>.<span class="ident">to_string</span>()));
    }
    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_decode_errors_enum</span>() {
        <span class="ident">check_err</span>::<span class="op">&lt;</span><span class="ident">DecodeEnum</span><span class="op">&gt;</span>(<span class="string">&quot;{}&quot;</span>,
                                <span class="ident">MissingFieldError</span>(<span class="string">&quot;variant&quot;</span>.<span class="ident">to_string</span>()));
        <span class="ident">check_err</span>::<span class="op">&lt;</span><span class="ident">DecodeEnum</span><span class="op">&gt;</span>(<span class="string">&quot;{\&quot;variant\&quot;: 1}&quot;</span>,
                                <span class="ident">ExpectedError</span>(<span class="string">&quot;String&quot;</span>.<span class="ident">to_string</span>(), <span class="string">&quot;1&quot;</span>.<span class="ident">to_string</span>()));
        <span class="ident">check_err</span>::<span class="op">&lt;</span><span class="ident">DecodeEnum</span><span class="op">&gt;</span>(<span class="string">&quot;{\&quot;variant\&quot;: \&quot;A\&quot;}&quot;</span>,
                                <span class="ident">MissingFieldError</span>(<span class="string">&quot;fields&quot;</span>.<span class="ident">to_string</span>()));
        <span class="ident">check_err</span>::<span class="op">&lt;</span><span class="ident">DecodeEnum</span><span class="op">&gt;</span>(<span class="string">&quot;{\&quot;variant\&quot;: \&quot;A\&quot;, \&quot;fields\&quot;: null}&quot;</span>,
                                <span class="ident">ExpectedError</span>(<span class="string">&quot;Array&quot;</span>.<span class="ident">to_string</span>(), <span class="string">&quot;null&quot;</span>.<span class="ident">to_string</span>()));
        <span class="ident">check_err</span>::<span class="op">&lt;</span><span class="ident">DecodeEnum</span><span class="op">&gt;</span>(<span class="string">&quot;{\&quot;variant\&quot;: \&quot;C\&quot;, \&quot;fields\&quot;: []}&quot;</span>,
                                <span class="ident">UnknownVariantError</span>(<span class="string">&quot;C&quot;</span>.<span class="ident">to_string</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_find</span>(){
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{\&quot;dog\&quot; : \&quot;cat\&quot;}&quot;</span>).<span class="ident">unwrap</span>();
        <span class="kw">let</span> <span class="ident">found_str</span> <span class="op">=</span> <span class="ident">json_value</span>.<span class="ident">find</span>(<span class="string">&quot;dog&quot;</span>);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">found_str</span>.<span class="ident">unwrap</span>().<span class="ident">as_string</span>().<span class="ident">unwrap</span>() <span class="op">==</span> <span class="string">&quot;cat&quot;</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_find_path</span>(){
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{\&quot;dog\&quot;:{\&quot;cat\&quot;: {\&quot;mouse\&quot; : \&quot;cheese\&quot;}}}&quot;</span>).<span class="ident">unwrap</span>();
        <span class="kw">let</span> <span class="ident">found_str</span> <span class="op">=</span> <span class="ident">json_value</span>.<span class="ident">find_path</span>(<span class="kw-2">&amp;</span>[<span class="string">&quot;dog&quot;</span>, <span class="string">&quot;cat&quot;</span>, <span class="string">&quot;mouse&quot;</span>]);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">found_str</span>.<span class="ident">unwrap</span>().<span class="ident">as_string</span>().<span class="ident">unwrap</span>() <span class="op">==</span> <span class="string">&quot;cheese&quot;</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_search</span>(){
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{\&quot;dog\&quot;:{\&quot;cat\&quot;: {\&quot;mouse\&quot; : \&quot;cheese\&quot;}}}&quot;</span>).<span class="ident">unwrap</span>();
        <span class="kw">let</span> <span class="ident">found_str</span> <span class="op">=</span> <span class="ident">json_value</span>.<span class="ident">search</span>(<span class="string">&quot;mouse&quot;</span>).<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">j</span><span class="op">|</span> <span class="ident">j</span>.<span class="ident">as_string</span>());
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">found_str</span>.<span class="ident">unwrap</span>() <span class="op">==</span> <span class="string">&quot;cheese&quot;</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_index</span>(){
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{\&quot;animals\&quot;:[\&quot;dog\&quot;,\&quot;cat\&quot;,\&quot;mouse\&quot;]}&quot;</span>).<span class="ident">unwrap</span>();
        <span class="kw">let</span> <span class="kw-2">ref</span> <span class="ident">array</span> <span class="op">=</span> <span class="ident">json_value</span>[<span class="string">&quot;animals&quot;</span>];
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">array</span>[<span class="number">0</span>].<span class="ident">as_string</span>().<span class="ident">unwrap</span>(), <span class="string">&quot;dog&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">array</span>[<span class="number">1</span>].<span class="ident">as_string</span>().<span class="ident">unwrap</span>(), <span class="string">&quot;cat&quot;</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">array</span>[<span class="number">2</span>].<span class="ident">as_string</span>().<span class="ident">unwrap</span>(), <span class="string">&quot;mouse&quot;</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_is_object</span>(){
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{}&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">json_value</span>.<span class="ident">is_object</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_as_object</span>(){
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{}&quot;</span>).<span class="ident">unwrap</span>();
        <span class="kw">let</span> <span class="ident">json_object</span> <span class="op">=</span> <span class="ident">json_value</span>.<span class="ident">as_object</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">json_object</span>.<span class="ident">is_some</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_is_array</span>(){
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;[1, 2, 3]&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">json_value</span>.<span class="ident">is_array</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_as_array</span>(){
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;[1, 2, 3]&quot;</span>).<span class="ident">unwrap</span>();
        <span class="kw">let</span> <span class="ident">json_array</span> <span class="op">=</span> <span class="ident">json_value</span>.<span class="ident">as_array</span>();
        <span class="kw">let</span> <span class="ident">expected_length</span> <span class="op">=</span> <span class="number">3</span>;
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">json_array</span>.<span class="ident">is_some</span>() <span class="op">&amp;&amp;</span> <span class="ident">json_array</span>.<span class="ident">unwrap</span>().<span class="ident">len</span>() <span class="op">==</span> <span class="ident">expected_length</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_is_string</span>(){
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;\&quot;dog\&quot;&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">json_value</span>.<span class="ident">is_string</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_as_string</span>(){
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;\&quot;dog\&quot;&quot;</span>).<span class="ident">unwrap</span>();
        <span class="kw">let</span> <span class="ident">json_str</span> <span class="op">=</span> <span class="ident">json_value</span>.<span class="ident">as_string</span>();
        <span class="kw">let</span> <span class="ident">expected_str</span> <span class="op">=</span> <span class="string">&quot;dog&quot;</span>;
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">json_str</span>, <span class="prelude-val">Some</span>(<span class="ident">expected_str</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_is_number</span>(){
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;12&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">json_value</span>.<span class="ident">is_number</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_is_i64</span>(){
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;-12&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">json_value</span>.<span class="ident">is_i64</span>());

        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;12&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">json_value</span>.<span class="ident">is_i64</span>());

        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;12.0&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">json_value</span>.<span class="ident">is_i64</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_is_u64</span>(){
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;12&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">json_value</span>.<span class="ident">is_u64</span>());

        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;-12&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">json_value</span>.<span class="ident">is_u64</span>());

        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;12.0&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">json_value</span>.<span class="ident">is_u64</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_is_f64</span>(){
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;12&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">json_value</span>.<span class="ident">is_f64</span>());

        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;-12&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">json_value</span>.<span class="ident">is_f64</span>());

        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;12.0&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">json_value</span>.<span class="ident">is_f64</span>());

        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;-12.0&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">json_value</span>.<span class="ident">is_f64</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_as_i64</span>(){
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;-12&quot;</span>).<span class="ident">unwrap</span>();
        <span class="kw">let</span> <span class="ident">json_num</span> <span class="op">=</span> <span class="ident">json_value</span>.<span class="ident">as_i64</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">json_num</span>, <span class="prelude-val">Some</span>(<span class="op">-</span><span class="number">12</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_as_u64</span>(){
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;12&quot;</span>).<span class="ident">unwrap</span>();
        <span class="kw">let</span> <span class="ident">json_num</span> <span class="op">=</span> <span class="ident">json_value</span>.<span class="ident">as_u64</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">json_num</span>, <span class="prelude-val">Some</span>(<span class="number">12</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_as_f64</span>(){
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;12.0&quot;</span>).<span class="ident">unwrap</span>();
        <span class="kw">let</span> <span class="ident">json_num</span> <span class="op">=</span> <span class="ident">json_value</span>.<span class="ident">as_f64</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">json_num</span>, <span class="prelude-val">Some</span>(<span class="number">12f64</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_is_boolean</span>(){
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;false&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">json_value</span>.<span class="ident">is_boolean</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_as_boolean</span>(){
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;false&quot;</span>).<span class="ident">unwrap</span>();
        <span class="kw">let</span> <span class="ident">json_bool</span> <span class="op">=</span> <span class="ident">json_value</span>.<span class="ident">as_boolean</span>();
        <span class="kw">let</span> <span class="ident">expected_bool</span> <span class="op">=</span> <span class="bool-val">false</span>;
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">json_bool</span>.<span class="ident">is_some</span>() <span class="op">&amp;&amp;</span> <span class="ident">json_bool</span>.<span class="ident">unwrap</span>() <span class="op">==</span> <span class="ident">expected_bool</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_is_null</span>(){
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;null&quot;</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">json_value</span>.<span class="ident">is_null</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_as_null</span>(){
        <span class="kw">let</span> <span class="ident">json_value</span> <span class="op">=</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;null&quot;</span>).<span class="ident">unwrap</span>();
        <span class="kw">let</span> <span class="ident">json_null</span> <span class="op">=</span> <span class="ident">json_value</span>.<span class="ident">as_null</span>();
        <span class="kw">let</span> <span class="ident">expected_null</span> <span class="op">=</span> ();
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">json_null</span>.<span class="ident">is_some</span>() <span class="op">&amp;&amp;</span> <span class="ident">json_null</span>.<span class="ident">unwrap</span>() <span class="op">==</span> <span class="ident">expected_null</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_encode_hashmap_with_numeric_key</span>() {
        <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">HashMap</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">hm</span>: <span class="ident">HashMap</span><span class="op">&lt;</span><span class="ident">usize</span>, <span class="ident">bool</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">HashMap</span>::<span class="ident">new</span>();
        <span class="ident">hm</span>.<span class="ident">insert</span>(<span class="number">1</span>, <span class="bool-val">true</span>);
        <span class="kw">let</span> <span class="ident">json_str</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">as_pretty_json</span>(<span class="kw-2">&amp;</span><span class="ident">hm</span>).<span class="ident">to_string</span>();
        <span class="kw">match</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="kw-2">&amp;</span><span class="ident">json_str</span>) {
            <span class="prelude-val">Err</span>(_) <span class="op">=&gt;</span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;Unable to parse json_str: {}&quot;</span>, <span class="ident">json_str</span>),
            _ <span class="op">=&gt;</span> {} <span class="comment">// it parsed and we are good to go</span>
        }
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_negative_zero</span>() {
        <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{\&quot;test\&quot;:-0}&quot;</span>).<span class="ident">unwrap</span>();
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_prettyencode_hashmap_with_numeric_key</span>() {
        <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">HashMap</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">hm</span>: <span class="ident">HashMap</span><span class="op">&lt;</span><span class="ident">usize</span>, <span class="ident">bool</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">HashMap</span>::<span class="ident">new</span>();
        <span class="ident">hm</span>.<span class="ident">insert</span>(<span class="number">1</span>, <span class="bool-val">true</span>);
        <span class="kw">let</span> <span class="ident">json_str</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">as_pretty_json</span>(<span class="kw-2">&amp;</span><span class="ident">hm</span>).<span class="ident">to_string</span>();
        <span class="kw">match</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="kw-2">&amp;</span><span class="ident">json_str</span>) {
            <span class="prelude-val">Err</span>(_) <span class="op">=&gt;</span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;Unable to parse json_str: {}&quot;</span>, <span class="ident">json_str</span>),
            _ <span class="op">=&gt;</span> {} <span class="comment">// it parsed and we are good to go</span>
        }
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_prettyencoder_indent_level_param</span>() {
        <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">BTreeMap</span>;

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tree</span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>();

        <span class="ident">tree</span>.<span class="ident">insert</span>(<span class="string">&quot;hello&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">String</span>(<span class="string">&quot;guten tag&quot;</span>.<span class="ident">to_string</span>()));
        <span class="ident">tree</span>.<span class="ident">insert</span>(<span class="string">&quot;goodbye&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">String</span>(<span class="string">&quot;sayonara&quot;</span>.<span class="ident">to_string</span>()));

        <span class="kw">let</span> <span class="ident">json</span> <span class="op">=</span> <span class="ident">Array</span>(
            <span class="comment">// The following layout below should look a lot like</span>
            <span class="comment">// the pretty-printed JSON (indent * x)</span>
            <span class="macro">vec</span><span class="macro">!</span>
            ( <span class="comment">// 0x</span>
                <span class="ident">String</span>(<span class="string">&quot;greetings&quot;</span>.<span class="ident">to_string</span>()), <span class="comment">// 1x</span>
                <span class="ident">Object</span>(<span class="ident">tree</span>), <span class="comment">// 1x + 2x + 2x + 1x</span>
            ) <span class="comment">// 0x</span>
            <span class="comment">// End JSON array (7 lines)</span>
        );

        <span class="comment">// Helper function for counting indents</span>
        <span class="kw">fn</span> <span class="ident">indents</span>(<span class="ident">source</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> {
            <span class="kw">let</span> <span class="ident">trimmed</span> <span class="op">=</span> <span class="ident">source</span>.<span class="ident">trim_left_matches</span>(<span class="string">&#39; &#39;</span>);
            <span class="ident">source</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="ident">trimmed</span>.<span class="ident">len</span>()
        }

        <span class="comment">// Test up to 4 spaces of indents (more?)</span>
        <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">4</span> {
            <span class="kw">let</span> <span class="ident">printed</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">as_pretty_json</span>(<span class="kw-2">&amp;</span><span class="ident">json</span>).<span class="ident">indent</span>(<span class="ident">i</span> <span class="kw">as</span> <span class="ident">u32</span>)
                                .<span class="ident">to_string</span>();

            <span class="comment">// Check for indents at each line</span>
            <span class="kw">let</span> <span class="ident">lines</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">printed</span>.<span class="ident">lines</span>().<span class="ident">collect</span>();
            <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">lines</span>.<span class="ident">len</span>(), <span class="number">7</span>); <span class="comment">// JSON should be 7 lines</span>

            <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">indents</span>(<span class="ident">lines</span>[<span class="number">0</span>]), <span class="number">0</span> <span class="op">*</span> <span class="ident">i</span>); <span class="comment">// [</span>
            <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">indents</span>(<span class="ident">lines</span>[<span class="number">1</span>]), <span class="number">1</span> <span class="op">*</span> <span class="ident">i</span>); <span class="comment">//   &quot;greetings&quot;,</span>
            <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">indents</span>(<span class="ident">lines</span>[<span class="number">2</span>]), <span class="number">1</span> <span class="op">*</span> <span class="ident">i</span>); <span class="comment">//   {</span>
            <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">indents</span>(<span class="ident">lines</span>[<span class="number">3</span>]), <span class="number">2</span> <span class="op">*</span> <span class="ident">i</span>); <span class="comment">//     &quot;hello&quot;: &quot;guten tag&quot;,</span>
            <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">indents</span>(<span class="ident">lines</span>[<span class="number">4</span>]), <span class="number">2</span> <span class="op">*</span> <span class="ident">i</span>); <span class="comment">//     &quot;goodbye&quot;: &quot;sayonara&quot;</span>
            <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">indents</span>(<span class="ident">lines</span>[<span class="number">5</span>]), <span class="number">1</span> <span class="op">*</span> <span class="ident">i</span>); <span class="comment">//   },</span>
            <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">indents</span>(<span class="ident">lines</span>[<span class="number">6</span>]), <span class="number">0</span> <span class="op">*</span> <span class="ident">i</span>); <span class="comment">// ]</span>

            <span class="comment">// Finally, test that the pretty-printed JSON is valid</span>
            <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="kw-2">&amp;</span><span class="ident">printed</span>).<span class="ident">ok</span>()
                 .<span class="ident">expect</span>(<span class="string">&quot;Pretty-printed JSON is invalid!&quot;</span>);
        }
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_hashmap_with_numeric_key_can_handle_double_quote_delimited_key</span>() {
        <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">HashMap</span>;
        <span class="kw">use</span> <span class="ident">Decodable</span>;
        <span class="kw">let</span> <span class="ident">json_str</span> <span class="op">=</span> <span class="string">&quot;{\&quot;1\&quot;:true}&quot;</span>;
        <span class="kw">let</span> <span class="ident">json_obj</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="ident">json_str</span>) {
            <span class="prelude-val">Err</span>(_) <span class="op">=&gt;</span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;Unable to parse json_str: {}&quot;</span>, <span class="ident">json_str</span>),
            <span class="prelude-val">Ok</span>(<span class="ident">o</span>) <span class="op">=&gt;</span> <span class="ident">o</span>
        };
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">decoder</span> <span class="op">=</span> <span class="ident">Decoder</span>::<span class="ident">new</span>(<span class="ident">json_obj</span>);
        <span class="kw">let</span> <span class="ident">_hm</span>: <span class="ident">HashMap</span><span class="op">&lt;</span><span class="ident">usize</span>, <span class="ident">bool</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">Decodable</span>::<span class="ident">decode</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">decoder</span>).<span class="ident">unwrap</span>();
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_hashmap_with_enum_key</span>() {
        <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">HashMap</span>;
        <span class="kw">use</span> <span class="ident">json</span>;
        <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">RustcEncodable</span>, <span class="ident">Eq</span>, <span class="ident">Hash</span>, <span class="ident">PartialEq</span>, <span class="ident">RustcDecodable</span>, <span class="ident">Debug</span>)]</span>
        <span class="kw">enum</span> <span class="ident">Enum</span> {
            <span class="ident">Foo</span>,
            <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span>
            <span class="ident">Bar</span>,
        }
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">map</span> <span class="op">=</span> <span class="ident">HashMap</span>::<span class="ident">new</span>();
        <span class="ident">map</span>.<span class="ident">insert</span>(<span class="ident">Enum</span>::<span class="ident">Foo</span>, <span class="number">0</span>);
        <span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">json</span>::<span class="ident">encode</span>(<span class="kw-2">&amp;</span><span class="ident">map</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">result</span>, <span class="string">r#&quot;{&quot;Foo&quot;:0}&quot;#</span>);
        <span class="kw">let</span> <span class="ident">decoded</span>: <span class="ident">HashMap</span><span class="op">&lt;</span><span class="ident">Enum</span>, _<span class="op">&gt;</span> <span class="op">=</span> <span class="ident">json</span>::<span class="ident">decode</span>(<span class="kw-2">&amp;</span><span class="ident">result</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">map</span>, <span class="ident">decoded</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_hashmap_with_numeric_key_will_error_with_string_keys</span>() {
        <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">HashMap</span>;
        <span class="kw">use</span> <span class="ident">Decodable</span>;
        <span class="kw">let</span> <span class="ident">json_str</span> <span class="op">=</span> <span class="string">&quot;{\&quot;a\&quot;:true}&quot;</span>;
        <span class="kw">let</span> <span class="ident">json_obj</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="ident">json_str</span>) {
            <span class="prelude-val">Err</span>(_) <span class="op">=&gt;</span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;Unable to parse json_str: {}&quot;</span>, <span class="ident">json_str</span>),
            <span class="prelude-val">Ok</span>(<span class="ident">o</span>) <span class="op">=&gt;</span> <span class="ident">o</span>
        };
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">decoder</span> <span class="op">=</span> <span class="ident">Decoder</span>::<span class="ident">new</span>(<span class="ident">json_obj</span>);
        <span class="kw">let</span> <span class="ident">result</span>: <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">HashMap</span><span class="op">&lt;</span><span class="ident">usize</span>, <span class="ident">bool</span><span class="op">&gt;</span>, <span class="ident">DecoderError</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">Decodable</span>::<span class="ident">decode</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">decoder</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">result</span>, <span class="prelude-val">Err</span>(<span class="ident">ExpectedError</span>(<span class="string">&quot;Number&quot;</span>.<span class="ident">to_string</span>(), <span class="string">&quot;a&quot;</span>.<span class="ident">to_string</span>())));
    }

    <span class="kw">fn</span> <span class="ident">assert_stream_equal</span>(<span class="ident">src</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>,
                           <span class="ident">expected</span>: <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">JsonEvent</span>, <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">StackElement</span><span class="op">&gt;</span>)<span class="op">&gt;</span>) {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">parser</span> <span class="op">=</span> <span class="ident">Parser</span>::<span class="ident">new</span>(<span class="ident">src</span>.<span class="ident">chars</span>());
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">loop</span> {
            <span class="kw">let</span> <span class="ident">evt</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">parser</span>.<span class="ident">next</span>() {
                <span class="prelude-val">Some</span>(<span class="ident">e</span>) <span class="op">=&gt;</span> <span class="ident">e</span>,
                <span class="prelude-val">None</span> <span class="op">=&gt;</span> { <span class="kw">break</span>; }
            };
            <span class="kw">let</span> (<span class="kw-2">ref</span> <span class="ident">expected_evt</span>, <span class="kw-2">ref</span> <span class="ident">expected_stack</span>) <span class="op">=</span> <span class="ident">expected</span>[<span class="ident">i</span>];
            <span class="kw">if</span> <span class="op">!</span><span class="ident">parser</span>.<span class="ident">stack</span>().<span class="ident">is_equal_to</span>(<span class="kw-2">&amp;</span><span class="ident">expected_stack</span>) {
                <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;Parser stack is not equal to {:?}&quot;</span>, <span class="ident">expected_stack</span>);
            }
            <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">evt</span>, <span class="ident">expected_evt</span>);
            <span class="ident">i</span><span class="op">+=</span><span class="number">1</span>;
        }
    }
    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">target_word_size</span> <span class="op">=</span> <span class="string">&quot;32&quot;</span>, <span class="ident">ignore</span>)]</span> <span class="comment">// FIXME(#14064)</span>
    <span class="kw">fn</span> <span class="ident">test_streaming_parser</span>() {
        <span class="ident">assert_stream_equal</span>(
            <span class="string">r#&quot;{ &quot;foo&quot;:&quot;bar&quot;, &quot;array&quot; : [0, 1, 2, 3, 4, 5], &quot;idents&quot;:[null,true,false]}&quot;#</span>,
            <span class="macro">vec</span><span class="macro">!</span>[
                (<span class="ident">ObjectStart</span>,             <span class="macro">vec</span><span class="macro">!</span>[]),
                  (<span class="ident">StringValue</span>(<span class="string">&quot;bar&quot;</span>.<span class="ident">to_string</span>()),   <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;foo&quot;</span>)]),
                  (<span class="ident">ArrayStart</span>,            <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;array&quot;</span>)]),
                    (<span class="ident">U64Value</span>(<span class="number">0</span>),         <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;array&quot;</span>), <span class="ident">Index</span>(<span class="number">0</span>)]),
                    (<span class="ident">U64Value</span>(<span class="number">1</span>),         <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;array&quot;</span>), <span class="ident">Index</span>(<span class="number">1</span>)]),
                    (<span class="ident">U64Value</span>(<span class="number">2</span>),         <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;array&quot;</span>), <span class="ident">Index</span>(<span class="number">2</span>)]),
                    (<span class="ident">U64Value</span>(<span class="number">3</span>),         <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;array&quot;</span>), <span class="ident">Index</span>(<span class="number">3</span>)]),
                    (<span class="ident">U64Value</span>(<span class="number">4</span>),         <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;array&quot;</span>), <span class="ident">Index</span>(<span class="number">4</span>)]),
                    (<span class="ident">U64Value</span>(<span class="number">5</span>),         <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;array&quot;</span>), <span class="ident">Index</span>(<span class="number">5</span>)]),
                  (<span class="ident">ArrayEnd</span>,              <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;array&quot;</span>)]),
                  (<span class="ident">ArrayStart</span>,            <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;idents&quot;</span>)]),
                    (<span class="ident">NullValue</span>,           <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;idents&quot;</span>), <span class="ident">Index</span>(<span class="number">0</span>)]),
                    (<span class="ident">BooleanValue</span>(<span class="bool-val">true</span>),  <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;idents&quot;</span>), <span class="ident">Index</span>(<span class="number">1</span>)]),
                    (<span class="ident">BooleanValue</span>(<span class="bool-val">false</span>), <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;idents&quot;</span>), <span class="ident">Index</span>(<span class="number">2</span>)]),
                  (<span class="ident">ArrayEnd</span>,              <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;idents&quot;</span>)]),
                (<span class="ident">ObjectEnd</span>,               <span class="macro">vec</span><span class="macro">!</span>[]),
            ]
        );
    }
    <span class="kw">fn</span> <span class="ident">last_event</span>(<span class="ident">src</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="ident">JsonEvent</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">parser</span> <span class="op">=</span> <span class="ident">Parser</span>::<span class="ident">new</span>(<span class="ident">src</span>.<span class="ident">chars</span>());
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">evt</span> <span class="op">=</span> <span class="ident">NullValue</span>;
        <span class="kw">loop</span> {
            <span class="ident">evt</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">parser</span>.<span class="ident">next</span>() {
                <span class="prelude-val">Some</span>(<span class="ident">e</span>) <span class="op">=&gt;</span> <span class="ident">e</span>,
                <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="kw">return</span> <span class="ident">evt</span>,
            }
        }
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">target_word_size</span> <span class="op">=</span> <span class="string">&quot;32&quot;</span>, <span class="ident">ignore</span>)]</span> <span class="comment">// FIXME(#14064)</span>
    <span class="kw">fn</span> <span class="ident">test_read_object_streaming</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;{ &quot;</span>),      <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingObject</span>, <span class="number">1</span>, <span class="number">3</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;{1&quot;</span>),      <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">KeyMustBeAString</span>,      <span class="number">1</span>, <span class="number">2</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;{ \&quot;a\&quot;&quot;</span>), <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingObject</span>, <span class="number">1</span>, <span class="number">6</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;{\&quot;a\&quot;&quot;</span>),  <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingObject</span>, <span class="number">1</span>, <span class="number">5</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;{\&quot;a\&quot; &quot;</span>), <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingObject</span>, <span class="number">1</span>, <span class="number">6</span>)));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;{\&quot;a\&quot; 1&quot;</span>),   <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">ExpectedColon</span>,         <span class="number">1</span>, <span class="number">6</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;{\&quot;a\&quot;:&quot;</span>),    <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingValue</span>,  <span class="number">1</span>, <span class="number">6</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;{\&quot;a\&quot;:1&quot;</span>),   <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingObject</span>, <span class="number">1</span>, <span class="number">7</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;{\&quot;a\&quot;:1 1&quot;</span>), <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>,         <span class="number">1</span>, <span class="number">8</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;{\&quot;a\&quot;:1,&quot;</span>),  <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingObject</span>, <span class="number">1</span>, <span class="number">8</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;{\&quot;a\&quot;:1,}&quot;</span>), <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">TrailingComma</span>, <span class="number">1</span>, <span class="number">8</span>)));

        <span class="ident">assert_stream_equal</span>(
            <span class="string">&quot;{}&quot;</span>,
            <span class="macro">vec</span><span class="macro">!</span>[(<span class="ident">ObjectStart</span>, <span class="macro">vec</span><span class="macro">!</span>[]), (<span class="ident">ObjectEnd</span>, <span class="macro">vec</span><span class="macro">!</span>[])]
        );
        <span class="ident">assert_stream_equal</span>(
            <span class="string">&quot;{\&quot;a\&quot;: 3}&quot;</span>,
            <span class="macro">vec</span><span class="macro">!</span>[
                (<span class="ident">ObjectStart</span>,        <span class="macro">vec</span><span class="macro">!</span>[]),
                  (<span class="ident">U64Value</span>(<span class="number">3</span>),      <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;a&quot;</span>)]),
                (<span class="ident">ObjectEnd</span>,          <span class="macro">vec</span><span class="macro">!</span>[]),
            ]
        );
        <span class="ident">assert_stream_equal</span>(
            <span class="string">&quot;{ \&quot;a\&quot;: null, \&quot;b\&quot; : true }&quot;</span>,
            <span class="macro">vec</span><span class="macro">!</span>[
                (<span class="ident">ObjectStart</span>,           <span class="macro">vec</span><span class="macro">!</span>[]),
                  (<span class="ident">NullValue</span>,           <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;a&quot;</span>)]),
                  (<span class="ident">BooleanValue</span>(<span class="bool-val">true</span>),  <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;b&quot;</span>)]),
                (<span class="ident">ObjectEnd</span>,             <span class="macro">vec</span><span class="macro">!</span>[]),
            ]
        );
        <span class="ident">assert_stream_equal</span>(
            <span class="string">&quot;{\&quot;a\&quot; : 1.0 ,\&quot;b\&quot;: [ true ]}&quot;</span>,
            <span class="macro">vec</span><span class="macro">!</span>[
                (<span class="ident">ObjectStart</span>,           <span class="macro">vec</span><span class="macro">!</span>[]),
                  (<span class="ident">F64Value</span>(<span class="number">1.0</span>),       <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;a&quot;</span>)]),
                  (<span class="ident">ArrayStart</span>,          <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;b&quot;</span>)]),
                    (<span class="ident">BooleanValue</span>(<span class="bool-val">true</span>),<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;b&quot;</span>), <span class="ident">Index</span>(<span class="number">0</span>)]),
                  (<span class="ident">ArrayEnd</span>,            <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;b&quot;</span>)]),
                (<span class="ident">ObjectEnd</span>,             <span class="macro">vec</span><span class="macro">!</span>[]),
            ]
        );
        <span class="ident">assert_stream_equal</span>(
            <span class="string">r#&quot;{
                &quot;a&quot;: 1.0,
                &quot;b&quot;: [
                    true,
                    &quot;foo\nbar&quot;,
                    { &quot;c&quot;: {&quot;d&quot;: null} },
                    &quot;\uD834\uDF06&quot;
                ]
            }&quot;#</span>,
            <span class="macro">vec</span><span class="macro">!</span>[
                (<span class="ident">ObjectStart</span>,                   <span class="macro">vec</span><span class="macro">!</span>[]),
                  (<span class="ident">F64Value</span>(<span class="number">1.0</span>),               <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;a&quot;</span>)]),
                  (<span class="ident">ArrayStart</span>,                  <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;b&quot;</span>)]),
                    (<span class="ident">BooleanValue</span>(<span class="bool-val">true</span>),        <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;b&quot;</span>), <span class="ident">Index</span>(<span class="number">0</span>)]),
                    (<span class="ident">StringValue</span>(<span class="string">&quot;foo\nbar&quot;</span>.<span class="ident">to_string</span>()),  <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;b&quot;</span>), <span class="ident">Index</span>(<span class="number">1</span>)]),
                    (<span class="ident">ObjectStart</span>,               <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;b&quot;</span>), <span class="ident">Index</span>(<span class="number">2</span>)]),
                      (<span class="ident">ObjectStart</span>,             <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;b&quot;</span>), <span class="ident">Index</span>(<span class="number">2</span>), <span class="ident">Key</span>(<span class="string">&quot;c&quot;</span>)]),
                        (<span class="ident">NullValue</span>,             <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;b&quot;</span>), <span class="ident">Index</span>(<span class="number">2</span>), <span class="ident">Key</span>(<span class="string">&quot;c&quot;</span>), <span class="ident">Key</span>(<span class="string">&quot;d&quot;</span>)]),
                      (<span class="ident">ObjectEnd</span>,               <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;b&quot;</span>), <span class="ident">Index</span>(<span class="number">2</span>), <span class="ident">Key</span>(<span class="string">&quot;c&quot;</span>)]),
                    (<span class="ident">ObjectEnd</span>,                 <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;b&quot;</span>), <span class="ident">Index</span>(<span class="number">2</span>)]),
                    (<span class="ident">StringValue</span>(<span class="string">&quot;\u{1D306}&quot;</span>.<span class="ident">to_string</span>()),  <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;b&quot;</span>), <span class="ident">Index</span>(<span class="number">3</span>)]),
                  (<span class="ident">ArrayEnd</span>,                    <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Key</span>(<span class="string">&quot;b&quot;</span>)]),
                (<span class="ident">ObjectEnd</span>,                     <span class="macro">vec</span><span class="macro">!</span>[]),
            ]
        );
    }
    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">target_word_size</span> <span class="op">=</span> <span class="string">&quot;32&quot;</span>, <span class="ident">ignore</span>)]</span> <span class="comment">// FIXME(#14064)</span>
    <span class="kw">fn</span> <span class="ident">test_read_array_streaming</span>() {
        <span class="ident">assert_stream_equal</span>(
            <span class="string">&quot;[]&quot;</span>,
            <span class="macro">vec</span><span class="macro">!</span>[
                (<span class="ident">ArrayStart</span>, <span class="macro">vec</span><span class="macro">!</span>[]),
                (<span class="ident">ArrayEnd</span>,   <span class="macro">vec</span><span class="macro">!</span>[]),
            ]
        );
        <span class="ident">assert_stream_equal</span>(
            <span class="string">&quot;[ ]&quot;</span>,
            <span class="macro">vec</span><span class="macro">!</span>[
                (<span class="ident">ArrayStart</span>, <span class="macro">vec</span><span class="macro">!</span>[]),
                (<span class="ident">ArrayEnd</span>,   <span class="macro">vec</span><span class="macro">!</span>[]),
            ]
        );
        <span class="ident">assert_stream_equal</span>(
            <span class="string">&quot;[true]&quot;</span>,
            <span class="macro">vec</span><span class="macro">!</span>[
                (<span class="ident">ArrayStart</span>,             <span class="macro">vec</span><span class="macro">!</span>[]),
                    (<span class="ident">BooleanValue</span>(<span class="bool-val">true</span>), <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Index</span>(<span class="number">0</span>)]),
                (<span class="ident">ArrayEnd</span>,               <span class="macro">vec</span><span class="macro">!</span>[]),
            ]
        );
        <span class="ident">assert_stream_equal</span>(
            <span class="string">&quot;[ false ]&quot;</span>,
            <span class="macro">vec</span><span class="macro">!</span>[
                (<span class="ident">ArrayStart</span>,              <span class="macro">vec</span><span class="macro">!</span>[]),
                    (<span class="ident">BooleanValue</span>(<span class="bool-val">false</span>), <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Index</span>(<span class="number">0</span>)]),
                (<span class="ident">ArrayEnd</span>,                <span class="macro">vec</span><span class="macro">!</span>[]),
            ]
        );
        <span class="ident">assert_stream_equal</span>(
            <span class="string">&quot;[null]&quot;</span>,
            <span class="macro">vec</span><span class="macro">!</span>[
                (<span class="ident">ArrayStart</span>,    <span class="macro">vec</span><span class="macro">!</span>[]),
                    (<span class="ident">NullValue</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Index</span>(<span class="number">0</span>)]),
                (<span class="ident">ArrayEnd</span>,      <span class="macro">vec</span><span class="macro">!</span>[]),
            ]
        );
        <span class="ident">assert_stream_equal</span>(
            <span class="string">&quot;[3, 1]&quot;</span>,
            <span class="macro">vec</span><span class="macro">!</span>[
                (<span class="ident">ArrayStart</span>,      <span class="macro">vec</span><span class="macro">!</span>[]),
                    (<span class="ident">U64Value</span>(<span class="number">3</span>), <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Index</span>(<span class="number">0</span>)]),
                    (<span class="ident">U64Value</span>(<span class="number">1</span>), <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Index</span>(<span class="number">1</span>)]),
                (<span class="ident">ArrayEnd</span>,        <span class="macro">vec</span><span class="macro">!</span>[]),
            ]
        );
        <span class="ident">assert_stream_equal</span>(
            <span class="string">&quot;\n[3, 2]\n&quot;</span>,
            <span class="macro">vec</span><span class="macro">!</span>[
                (<span class="ident">ArrayStart</span>,      <span class="macro">vec</span><span class="macro">!</span>[]),
                    (<span class="ident">U64Value</span>(<span class="number">3</span>), <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Index</span>(<span class="number">0</span>)]),
                    (<span class="ident">U64Value</span>(<span class="number">2</span>), <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Index</span>(<span class="number">1</span>)]),
                (<span class="ident">ArrayEnd</span>,        <span class="macro">vec</span><span class="macro">!</span>[]),
            ]
        );
        <span class="ident">assert_stream_equal</span>(
            <span class="string">&quot;[2, [4, 1]]&quot;</span>,
            <span class="macro">vec</span><span class="macro">!</span>[
                (<span class="ident">ArrayStart</span>,           <span class="macro">vec</span><span class="macro">!</span>[]),
                    (<span class="ident">U64Value</span>(<span class="number">2</span>),      <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Index</span>(<span class="number">0</span>)]),
                    (<span class="ident">ArrayStart</span>,       <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Index</span>(<span class="number">1</span>)]),
                        (<span class="ident">U64Value</span>(<span class="number">4</span>),  <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Index</span>(<span class="number">1</span>), <span class="ident">Index</span>(<span class="number">0</span>)]),
                        (<span class="ident">U64Value</span>(<span class="number">1</span>),  <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Index</span>(<span class="number">1</span>), <span class="ident">Index</span>(<span class="number">1</span>)]),
                    (<span class="ident">ArrayEnd</span>,         <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Index</span>(<span class="number">1</span>)]),
                (<span class="ident">ArrayEnd</span>,             <span class="macro">vec</span><span class="macro">!</span>[]),
            ]
        );

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;[&quot;</span>), <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingValue</span>, <span class="number">1</span>,  <span class="number">2</span>)));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;[&quot;</span>),     <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingValue</span>, <span class="number">1</span>, <span class="number">2</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;[1&quot;</span>),    <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingArray</span>, <span class="number">1</span>, <span class="number">3</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;[1,&quot;</span>),   <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">EOFWhileParsingValue</span>, <span class="number">1</span>, <span class="number">4</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;[1,]&quot;</span>),  <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>,        <span class="number">1</span>, <span class="number">4</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;[6 7]&quot;</span>), <span class="prelude-val">Err</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>,        <span class="number">1</span>, <span class="number">4</span>)));

    }
    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_trailing_characters_streaming</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;nulla&quot;</span>),  <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">TrailingCharacters</span>, <span class="number">1</span>, <span class="number">5</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;truea&quot;</span>),  <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">TrailingCharacters</span>, <span class="number">1</span>, <span class="number">5</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;falsea&quot;</span>), <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">TrailingCharacters</span>, <span class="number">1</span>, <span class="number">6</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;1a&quot;</span>),     <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">TrailingCharacters</span>, <span class="number">1</span>, <span class="number">2</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;[]a&quot;</span>),    <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">TrailingCharacters</span>, <span class="number">1</span>, <span class="number">3</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;{}a&quot;</span>),    <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">TrailingCharacters</span>, <span class="number">1</span>, <span class="number">3</span>)));
    }
    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_read_identifiers_streaming</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Parser</span>::<span class="ident">new</span>(<span class="string">&quot;null&quot;</span>.<span class="ident">chars</span>()).<span class="ident">next</span>(), <span class="prelude-val">Some</span>(<span class="ident">NullValue</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Parser</span>::<span class="ident">new</span>(<span class="string">&quot;true&quot;</span>.<span class="ident">chars</span>()).<span class="ident">next</span>(), <span class="prelude-val">Some</span>(<span class="ident">BooleanValue</span>(<span class="bool-val">true</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Parser</span>::<span class="ident">new</span>(<span class="string">&quot;false&quot;</span>.<span class="ident">chars</span>()).<span class="ident">next</span>(), <span class="prelude-val">Some</span>(<span class="ident">BooleanValue</span>(<span class="bool-val">false</span>)));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;n&quot;</span>),    <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>, <span class="number">1</span>, <span class="number">2</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;nul&quot;</span>),  <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>, <span class="number">1</span>, <span class="number">4</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;t&quot;</span>),    <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>, <span class="number">1</span>, <span class="number">2</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;truz&quot;</span>), <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>, <span class="number">1</span>, <span class="number">4</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;f&quot;</span>),    <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>, <span class="number">1</span>, <span class="number">2</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_event</span>(<span class="string">&quot;faz&quot;</span>),  <span class="ident">Error</span>(<span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>, <span class="number">1</span>, <span class="number">3</span>)));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_stack</span>() {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">stack</span> <span class="op">=</span> <span class="ident">Stack</span>::<span class="ident">new</span>();

        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">is_empty</span>());
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">0</span>);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">stack</span>.<span class="ident">last_is_index</span>());

        <span class="ident">stack</span>.<span class="ident">push_index</span>(<span class="number">0</span>);
        <span class="ident">stack</span>.<span class="ident">bump_index</span>();

        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">1</span>);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">is_equal_to</span>(<span class="kw-2">&amp;</span>[<span class="ident">Index</span>(<span class="number">1</span>)]));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">starts_with</span>(<span class="kw-2">&amp;</span>[<span class="ident">Index</span>(<span class="number">1</span>)]));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">ends_with</span>(<span class="kw-2">&amp;</span>[<span class="ident">Index</span>(<span class="number">1</span>)]));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">last_is_index</span>());
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">get</span>(<span class="number">0</span>) <span class="op">==</span> <span class="ident">Index</span>(<span class="number">1</span>));

        <span class="ident">stack</span>.<span class="ident">push_key</span>(<span class="string">&quot;foo&quot;</span>.<span class="ident">to_string</span>());

        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">2</span>);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">is_equal_to</span>(<span class="kw-2">&amp;</span>[<span class="ident">Index</span>(<span class="number">1</span>), <span class="ident">Key</span>(<span class="string">&quot;foo&quot;</span>)]));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">starts_with</span>(<span class="kw-2">&amp;</span>[<span class="ident">Index</span>(<span class="number">1</span>), <span class="ident">Key</span>(<span class="string">&quot;foo&quot;</span>)]));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">starts_with</span>(<span class="kw-2">&amp;</span>[<span class="ident">Index</span>(<span class="number">1</span>)]));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">ends_with</span>(<span class="kw-2">&amp;</span>[<span class="ident">Index</span>(<span class="number">1</span>), <span class="ident">Key</span>(<span class="string">&quot;foo&quot;</span>)]));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">ends_with</span>(<span class="kw-2">&amp;</span>[<span class="ident">Key</span>(<span class="string">&quot;foo&quot;</span>)]));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">stack</span>.<span class="ident">last_is_index</span>());
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">get</span>(<span class="number">0</span>) <span class="op">==</span> <span class="ident">Index</span>(<span class="number">1</span>));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">get</span>(<span class="number">1</span>) <span class="op">==</span> <span class="ident">Key</span>(<span class="string">&quot;foo&quot;</span>));

        <span class="ident">stack</span>.<span class="ident">push_key</span>(<span class="string">&quot;bar&quot;</span>.<span class="ident">to_string</span>());

        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">3</span>);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">is_equal_to</span>(<span class="kw-2">&amp;</span>[<span class="ident">Index</span>(<span class="number">1</span>), <span class="ident">Key</span>(<span class="string">&quot;foo&quot;</span>), <span class="ident">Key</span>(<span class="string">&quot;bar&quot;</span>)]));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">starts_with</span>(<span class="kw-2">&amp;</span>[<span class="ident">Index</span>(<span class="number">1</span>)]));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">starts_with</span>(<span class="kw-2">&amp;</span>[<span class="ident">Index</span>(<span class="number">1</span>), <span class="ident">Key</span>(<span class="string">&quot;foo&quot;</span>)]));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">starts_with</span>(<span class="kw-2">&amp;</span>[<span class="ident">Index</span>(<span class="number">1</span>), <span class="ident">Key</span>(<span class="string">&quot;foo&quot;</span>), <span class="ident">Key</span>(<span class="string">&quot;bar&quot;</span>)]));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">ends_with</span>(<span class="kw-2">&amp;</span>[<span class="ident">Key</span>(<span class="string">&quot;bar&quot;</span>)]));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">ends_with</span>(<span class="kw-2">&amp;</span>[<span class="ident">Key</span>(<span class="string">&quot;foo&quot;</span>), <span class="ident">Key</span>(<span class="string">&quot;bar&quot;</span>)]));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">ends_with</span>(<span class="kw-2">&amp;</span>[<span class="ident">Index</span>(<span class="number">1</span>), <span class="ident">Key</span>(<span class="string">&quot;foo&quot;</span>), <span class="ident">Key</span>(<span class="string">&quot;bar&quot;</span>)]));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">stack</span>.<span class="ident">last_is_index</span>());
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">get</span>(<span class="number">0</span>) <span class="op">==</span> <span class="ident">Index</span>(<span class="number">1</span>));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">get</span>(<span class="number">1</span>) <span class="op">==</span> <span class="ident">Key</span>(<span class="string">&quot;foo&quot;</span>));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">get</span>(<span class="number">2</span>) <span class="op">==</span> <span class="ident">Key</span>(<span class="string">&quot;bar&quot;</span>));

        <span class="ident">stack</span>.<span class="ident">pop</span>();

        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">2</span>);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">is_equal_to</span>(<span class="kw-2">&amp;</span>[<span class="ident">Index</span>(<span class="number">1</span>), <span class="ident">Key</span>(<span class="string">&quot;foo&quot;</span>)]));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">starts_with</span>(<span class="kw-2">&amp;</span>[<span class="ident">Index</span>(<span class="number">1</span>), <span class="ident">Key</span>(<span class="string">&quot;foo&quot;</span>)]));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">starts_with</span>(<span class="kw-2">&amp;</span>[<span class="ident">Index</span>(<span class="number">1</span>)]));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">ends_with</span>(<span class="kw-2">&amp;</span>[<span class="ident">Index</span>(<span class="number">1</span>), <span class="ident">Key</span>(<span class="string">&quot;foo&quot;</span>)]));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">ends_with</span>(<span class="kw-2">&amp;</span>[<span class="ident">Key</span>(<span class="string">&quot;foo&quot;</span>)]));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">stack</span>.<span class="ident">last_is_index</span>());
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">get</span>(<span class="number">0</span>) <span class="op">==</span> <span class="ident">Index</span>(<span class="number">1</span>));
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">stack</span>.<span class="ident">get</span>(<span class="number">1</span>) <span class="op">==</span> <span class="ident">Key</span>(<span class="string">&quot;foo&quot;</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_to_json</span>() {
        <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::{<span class="ident">HashMap</span>,<span class="ident">BTreeMap</span>};
        <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">ToJson</span>;

        <span class="kw">let</span> <span class="ident">array2</span> <span class="op">=</span> <span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>(<span class="ident">I64</span>(<span class="number">1</span>), <span class="ident">I64</span>(<span class="number">2</span>)));
        <span class="kw">let</span> <span class="ident">array3</span> <span class="op">=</span> <span class="ident">Array</span>(<span class="macro">vec</span><span class="macro">!</span>(<span class="ident">I64</span>(<span class="number">1</span>), <span class="ident">I64</span>(<span class="number">2</span>), <span class="ident">I64</span>(<span class="number">3</span>)));
        <span class="kw">let</span> <span class="ident">object</span> <span class="op">=</span> {
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tree_map</span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>();
            <span class="ident">tree_map</span>.<span class="ident">insert</span>(<span class="string">&quot;a&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">U64</span>(<span class="number">1</span>));
            <span class="ident">tree_map</span>.<span class="ident">insert</span>(<span class="string">&quot;b&quot;</span>.<span class="ident">to_string</span>(), <span class="ident">U64</span>(<span class="number">2</span>));
            <span class="ident">Object</span>(<span class="ident">tree_map</span>)
        };

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">array2</span>.<span class="ident">to_json</span>(), <span class="ident">array2</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">object</span>.<span class="ident">to_json</span>(), <span class="ident">object</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">3_isize</span>.<span class="ident">to_json</span>(), <span class="ident">I64</span>(<span class="number">3</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">4_i8</span>.<span class="ident">to_json</span>(), <span class="ident">I64</span>(<span class="number">4</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">5_i16</span>.<span class="ident">to_json</span>(), <span class="ident">I64</span>(<span class="number">5</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">6_i32</span>.<span class="ident">to_json</span>(), <span class="ident">I64</span>(<span class="number">6</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">7_i64</span>.<span class="ident">to_json</span>(), <span class="ident">I64</span>(<span class="number">7</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">8_usize</span>.<span class="ident">to_json</span>(), <span class="ident">U64</span>(<span class="number">8</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">9_u8</span>.<span class="ident">to_json</span>(), <span class="ident">U64</span>(<span class="number">9</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">10_u16</span>.<span class="ident">to_json</span>(), <span class="ident">U64</span>(<span class="number">10</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">11_u32</span>.<span class="ident">to_json</span>(), <span class="ident">U64</span>(<span class="number">11</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">12_u64</span>.<span class="ident">to_json</span>(), <span class="ident">U64</span>(<span class="number">12</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">13.0_f32</span>.<span class="ident">to_json</span>(), <span class="ident">F64</span>(<span class="number">13.0_f64</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">14.0_f64</span>.<span class="ident">to_json</span>(), <span class="ident">F64</span>(<span class="number">14.0_f64</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(().<span class="ident">to_json</span>(), <span class="ident">Null</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">f32</span>::<span class="ident">INFINITY</span>.<span class="ident">to_json</span>(), <span class="ident">Null</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">f64</span>::<span class="ident">NAN</span>.<span class="ident">to_json</span>(), <span class="ident">Null</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="bool-val">true</span>.<span class="ident">to_json</span>(), <span class="ident">Boolean</span>(<span class="bool-val">true</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="bool-val">false</span>.<span class="ident">to_json</span>(), <span class="ident">Boolean</span>(<span class="bool-val">false</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;abc&quot;</span>.<span class="ident">to_json</span>(), <span class="ident">String</span>(<span class="string">&quot;abc&quot;</span>.<span class="ident">to_string</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;abc&quot;</span>.<span class="ident">to_string</span>().<span class="ident">to_json</span>(), <span class="ident">String</span>(<span class="string">&quot;abc&quot;</span>.<span class="ident">to_string</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>((<span class="number">1</span>, <span class="number">2</span>).<span class="ident">to_json</span>(), <span class="ident">array2</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>((<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>).<span class="ident">to_json</span>(), <span class="ident">array3</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>([<span class="number">1</span>, <span class="number">2</span>].<span class="ident">to_json</span>(), <span class="ident">array2</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>((<span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]).<span class="ident">to_json</span>(), <span class="ident">array3</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>((<span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">2</span>]).<span class="ident">to_json</span>(), <span class="ident">array2</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">vec</span><span class="macro">!</span>(<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>).<span class="ident">to_json</span>(), <span class="ident">array3</span>);
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tree_map</span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>();
        <span class="ident">tree_map</span>.<span class="ident">insert</span>(<span class="string">&quot;a&quot;</span>.<span class="ident">to_string</span>(), <span class="number">1</span> <span class="kw">as</span> <span class="ident">u32</span>);
        <span class="ident">tree_map</span>.<span class="ident">insert</span>(<span class="string">&quot;b&quot;</span>.<span class="ident">to_string</span>(), <span class="number">2</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">tree_map</span>.<span class="ident">to_json</span>(), <span class="ident">object</span>);
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">hash_map</span> <span class="op">=</span> <span class="ident">HashMap</span>::<span class="ident">new</span>();
        <span class="ident">hash_map</span>.<span class="ident">insert</span>(<span class="string">&quot;a&quot;</span>.<span class="ident">to_string</span>(), <span class="number">1</span> <span class="kw">as</span> <span class="ident">u32</span>);
        <span class="ident">hash_map</span>.<span class="ident">insert</span>(<span class="string">&quot;b&quot;</span>.<span class="ident">to_string</span>(), <span class="number">2</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">hash_map</span>.<span class="ident">to_json</span>(), <span class="ident">object</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">15</span>).<span class="ident">to_json</span>(), <span class="ident">I64</span>(<span class="number">15</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">15</span> <span class="kw">as</span> <span class="ident">u32</span>).<span class="ident">to_json</span>(), <span class="ident">U64</span>(<span class="number">15</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>::<span class="op">&lt;</span><span class="ident">isize</span><span class="op">&gt;</span>.<span class="ident">to_json</span>(), <span class="ident">Null</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_encode_hashmap_with_arbitrary_key</span>() {
        <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">HashMap</span>;
        <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">Hash</span>, <span class="ident">RustcEncodable</span>)]</span>
        <span class="kw">struct</span> <span class="ident">ArbitraryType</span>(<span class="ident">u32</span>);
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">hm</span>: <span class="ident">HashMap</span><span class="op">&lt;</span><span class="ident">ArbitraryType</span>, <span class="ident">bool</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">HashMap</span>::<span class="ident">new</span>();
        <span class="ident">hm</span>.<span class="ident">insert</span>(<span class="ident">ArbitraryType</span>(<span class="number">1</span>), <span class="bool-val">true</span>);
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">mem_buf</span> <span class="op">=</span> <span class="ident">string</span>::<span class="ident">String</span>::<span class="ident">new</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">encoder</span> <span class="op">=</span> <span class="ident">Encoder</span>::<span class="ident">new</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">mem_buf</span>);
        <span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">hm</span>.<span class="ident">encode</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">encoder</span>);
        <span class="kw">match</span> <span class="ident">result</span>.<span class="ident">err</span>().<span class="ident">unwrap</span>() {
            <span class="ident">EncoderError</span>::<span class="ident">BadHashmapKey</span> <span class="op">=&gt;</span> (),
            _ <span class="op">=&gt;</span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">&quot;expected bad hash map key&quot;</span>)
        }
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_encode_decode_phantom_data</span>() {
        <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">marker</span>::<span class="ident">PhantomData</span>;

        <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">RustcDecodable</span>, <span class="ident">RustcEncodable</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>)]</span>
        <span class="kw">struct</span> <span class="ident">Foo</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> {
            <span class="ident">phantom_data</span>: <span class="ident">PhantomData</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span>
        }

        <span class="kw">let</span> <span class="ident">f</span>: <span class="ident">Foo</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">Foo</span> {
            <span class="ident">phantom_data</span>: <span class="ident">PhantomData</span>
        };
        <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">encode</span>(<span class="kw-2">&amp;</span><span class="ident">f</span>).<span class="ident">unwrap</span>();
        <span class="kw">let</span> <span class="ident">d</span>: <span class="ident">Foo</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="kw-2">&amp;</span><span class="ident">s</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="ident">d</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_bad_json_stack_depleted</span>() {
        <span class="kw">use</span> <span class="ident">json</span>;
        <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">RustcDecodable</span>)]</span>
        <span class="kw">enum</span> <span class="ident">ChatEvent</span> {
            <span class="ident">Variant</span>(<span class="ident">i32</span>)
        }
        <span class="kw">let</span> <span class="ident">serialized</span> <span class="op">=</span> <span class="string">&quot;{\&quot;variant\&quot;: \&quot;Variant\&quot;, \&quot;fields\&quot;: []}&quot;</span>;
        <span class="kw">let</span> <span class="ident">r</span>: <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">ChatEvent</span>, _<span class="op">&gt;</span> <span class="op">=</span> <span class="ident">json</span>::<span class="ident">decode</span>(<span class="ident">serialized</span>);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">unwrap_err</span>() <span class="op">==</span> <span class="ident">EOF</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">fixed_length_array</span>() {
        <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">RustcDecodable</span>, <span class="ident">RustcEncodable</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>)]</span>
        <span class="kw">struct</span> <span class="ident">Foo</span> {
            <span class="ident">a</span>: [<span class="ident">u8</span>; <span class="number">1</span>],
            <span class="ident">b</span>: [<span class="ident">i32</span>; <span class="number">2</span>],
            <span class="ident">c</span>: [<span class="ident">u64</span>; <span class="number">3</span>],
        }
        <span class="kw">let</span> <span class="ident">f</span> <span class="op">=</span> <span class="ident">Foo</span> {
            <span class="ident">a</span>: [<span class="number">0</span>],
            <span class="ident">b</span>: [<span class="number">1</span>, <span class="number">2</span>],
            <span class="ident">c</span>: [<span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>],
        };
        <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">encode</span>(<span class="kw-2">&amp;</span><span class="ident">f</span>).<span class="ident">unwrap</span>();
        <span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">decode</span>(<span class="kw-2">&amp;</span><span class="ident">s</span>).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="ident">d</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_unexpected_token</span>() {
        <span class="kw">match</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="string">&quot;{\&quot;\&quot;:\&quot;\&quot;,\&quot;\&quot;:{\&quot;\&quot;:\&quot;\&quot;,\&quot;\&quot;:[{\&quot;\&quot;:\&quot;\&quot;,}}}&quot;</span>) {
            <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=&gt;</span> <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">e</span>, <span class="ident">SyntaxError</span>(<span class="ident">InvalidSyntax</span>, <span class="number">1</span>, <span class="number">32</span>)),
            _ <span class="op">=&gt;</span> ()
        };
    }
}
</pre>
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