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</pre><pre class="rust ">
<span class="comment">// Copyright (c) 2015 Anders Kaseorg <andersk@mit.edu></span>
<span class="comment">// Permission is hereby granted, free of charge, to any person obtaining</span>
<span class="comment">// a copy of this software and associated documentation files (the</span>
<span class="comment">// “Software”), to deal in the Software without restriction, including</span>
<span class="comment">// without limitation the rights to use, copy, modify, merge, publish,</span>
<span class="comment">// distribute, sublicense, and/or sell copies of the Software, and to</span>
<span class="comment">// permit persons to whom the Software is furnished to do so, subject to</span>
<span class="comment">// the following conditions:</span>
<span class="comment">// The above copyright notice and this permission notice shall be</span>
<span class="comment">// included in all copies or substantial portions of the Software.</span>
<span class="comment">// THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND,</span>
<span class="comment">// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF</span>
<span class="comment">// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.</span>
<span class="comment">// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY</span>
<span class="comment">// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,</span>
<span class="comment">// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE</span>
<span class="comment">// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.</span>
<span class="doccomment">//! This crate exports a macro `enum_from_primitive!` that wraps an</span>
<span class="doccomment">//! `enum` declaration and automatically adds an implementation of</span>
<span class="doccomment">//! `num::FromPrimitive` (reexported here), to allow conversion from</span>
<span class="doccomment">//! primitive integers to the enum. It therefore provides an</span>
<span class="doccomment">//! alternative to the built-in `#[derive(FromPrimitive)]`, which</span>
<span class="doccomment">//! requires the unstable `std::num::FromPrimitive` and is disabled in</span>
<span class="doccomment">//! Rust 1.0.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Example</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! #[macro_use] extern crate enum_primitive;</span>
<span class="doccomment">//! extern crate num_traits;</span>
<span class="doccomment">//! use num_traits::FromPrimitive;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! enum_from_primitive! {</span>
<span class="doccomment">//! #[derive(Debug, PartialEq)]</span>
<span class="doccomment">//! enum FooBar {</span>
<span class="doccomment">//! Foo = 17,</span>
<span class="doccomment">//! Bar = 42,</span>
<span class="doccomment">//! Baz,</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn main() {</span>
<span class="doccomment">//! assert_eq!(FooBar::from_i32(17), Some(FooBar::Foo));</span>
<span class="doccomment">//! assert_eq!(FooBar::from_i32(42), Some(FooBar::Bar));</span>
<span class="doccomment">//! assert_eq!(FooBar::from_i32(43), Some(FooBar::Baz));</span>
<span class="doccomment">//! assert_eq!(FooBar::from_i32(91), None);</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">num_traits</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">option</span>::<span class="prelude-ty">Option</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">num_traits</span>::<span class="ident">FromPrimitive</span>;
<span class="doccomment">/// Helper macro for internal use by `enum_from_primitive!`.</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">enum_from_primitive_impl_ty</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">meth</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>:<span class="ident">ty</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">variant</span>:<span class="ident">ident</span> )<span class="kw-2">*</span>) <span class="op">=></span> {
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">non_upper_case_globals</span>, <span class="ident">unused</span>)]</span>
<span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">meth</span>(<span class="ident">n</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>) <span class="op">-></span> <span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
$( <span class="kw">if</span> <span class="macro-nonterminal">n</span> <span class="op">==</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span> {
<span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="prelude-ty">Option</span>::<span class="prelude-val">Some</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span>)
} <span class="kw">else</span> )<span class="op">*</span> {
<span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="prelude-ty">Option</span>::<span class="prelude-val">None</span>
}
}
};
}
<span class="doccomment">/// Helper macro for internal use by `enum_from_primitive!`.</span>
<span class="attribute">#[<span class="macro-nonterminal">macro_export</span>]</span>
<span class="attribute">#[<span class="ident">macro_use</span>(<span class="ident">enum_from_primitive_impl_ty</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">enum_from_primitive_impl</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">variant</span>:<span class="ident">ident</span> )<span class="kw-2">*</span>) <span class="op">=></span> {
<span class="kw">impl</span> <span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">FromPrimitive</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> {
<span class="macro">enum_from_primitive_impl_ty</span><span class="macro">!</span> { <span class="ident">from_i64</span>, <span class="ident">i64</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>, $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span> )<span class="op">*</span> }
<span class="macro">enum_from_primitive_impl_ty</span><span class="macro">!</span> { <span class="ident">from_u64</span>, <span class="ident">u64</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>, $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span> )<span class="op">*</span> }
}
};
}
<span class="doccomment">/// Wrap this macro around an `enum` declaration to get an</span>
<span class="doccomment">/// automatically generated implementation of `num::FromPrimitive`.</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="attribute">#[<span class="ident">macro_use</span>(<span class="ident">enum_from_primitive_impl</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">enum_from_primitive</span> {
(
$( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">enum_attr</span>:<span class="ident">meta</span>]</span> )<span class="op">*</span>
<span class="kw">enum</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span> {
$( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_attr</span>:<span class="ident">meta</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span>:<span class="ident">ident</span> ),<span class="op">+</span> $( <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">discriminator</span>:<span class="ident">expr</span>, $( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_two_attr</span>:<span class="ident">meta</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_two</span>:<span class="ident">ident</span> ),<span class="op">+</span> )<span class="op">*</span>
}
) <span class="op">=></span> {
$( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">enum_attr</span>]</span> )<span class="op">*</span>
<span class="kw">enum</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> {
$( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_attr</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span> ),<span class="op">+</span> $( <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">discriminator</span>, $( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_two_attr</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_two</span> ),<span class="op">+</span> )<span class="op">*</span>
}
<span class="macro">enum_from_primitive_impl</span><span class="macro">!</span> { <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>, $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span> )<span class="op">+</span> $( $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_two</span> )<span class="op">+</span> )<span class="op">*</span> }
};
(
$( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">enum_attr</span>:<span class="ident">meta</span>]</span> )<span class="op">*</span>
<span class="kw">enum</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span> {
$( $( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_attr</span>:<span class="ident">meta</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span>:<span class="ident">ident</span> ),<span class="op">+</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">discriminator</span>:<span class="ident">expr</span> ),<span class="op">*</span>
}
) <span class="op">=></span> {
$( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">enum_attr</span>]</span> )<span class="op">*</span>
<span class="kw">enum</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> {
$( $( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_attr</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span> ),<span class="op">+</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">discriminator</span> ),<span class="op">*</span>
}
<span class="macro">enum_from_primitive_impl</span><span class="macro">!</span> { <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>, $( $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span> )<span class="op">+</span> )<span class="op">*</span> }
};
(
$( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">enum_attr</span>:<span class="ident">meta</span>]</span> )<span class="op">*</span>
<span class="kw">enum</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span> {
$( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_attr</span>:<span class="ident">meta</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span>:<span class="ident">ident</span> ),<span class="op">+</span> $( <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">discriminator</span>:<span class="ident">expr</span>, $( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_two_attr</span>:<span class="ident">meta</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_two</span>:<span class="ident">ident</span> ),<span class="op">+</span> )<span class="kw-2">*</span>,
}
) <span class="op">=></span> {
$( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">enum_attr</span>]</span> )<span class="op">*</span>
<span class="kw">enum</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> {
$( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_attr</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span> ),<span class="op">+</span> $( <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">discriminator</span>, $( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_two_attr</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_two</span> ),<span class="op">+</span> )<span class="kw-2">*</span>,
}
<span class="macro">enum_from_primitive_impl</span><span class="macro">!</span> { <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>, $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span> )<span class="op">+</span> $( $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_two</span> )<span class="op">+</span> )<span class="op">*</span> }
};
(
$( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">enum_attr</span>:<span class="ident">meta</span>]</span> )<span class="op">*</span>
<span class="kw">enum</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span> {
$( $( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_attr</span>:<span class="ident">meta</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span>:<span class="ident">ident</span> ),<span class="op">+</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">discriminator</span>:<span class="ident">expr</span> ),<span class="op">+</span>,
}
) <span class="op">=></span> {
$( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">enum_attr</span>]</span> )<span class="op">*</span>
<span class="kw">enum</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> {
$( $( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_attr</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span> ),<span class="op">+</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">discriminator</span> ),<span class="op">+</span>,
}
<span class="macro">enum_from_primitive_impl</span><span class="macro">!</span> { <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>, $( $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span> )<span class="op">+</span> )<span class="op">+</span> }
};
(
$( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">enum_attr</span>:<span class="ident">meta</span>]</span> )<span class="op">*</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span> {
$( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_attr</span>:<span class="ident">meta</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span>:<span class="ident">ident</span> ),<span class="op">+</span> $( <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">discriminator</span>:<span class="ident">expr</span>, $( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_two_attr</span>:<span class="ident">meta</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_two</span>:<span class="ident">ident</span> ),<span class="op">+</span> )<span class="op">*</span>
}
) <span class="op">=></span> {
$( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">enum_attr</span>]</span> )<span class="op">*</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> {
$( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_attr</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span> ),<span class="op">+</span> $( <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">discriminator</span>, $( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_two_attr</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_two</span> ),<span class="op">+</span> )<span class="op">*</span>
}
<span class="macro">enum_from_primitive_impl</span><span class="macro">!</span> { <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>, $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span> )<span class="op">+</span> $( $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_two</span> )<span class="op">+</span> )<span class="op">*</span> }
};
(
$( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">enum_attr</span>:<span class="ident">meta</span>]</span> )<span class="op">*</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span> {
$( $( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_attr</span>:<span class="ident">meta</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span>:<span class="ident">ident</span> ),<span class="op">+</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">discriminator</span>:<span class="ident">expr</span> ),<span class="op">*</span>
}
) <span class="op">=></span> {
$( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">enum_attr</span>]</span> )<span class="op">*</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> {
$( $( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_attr</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span> ),<span class="op">+</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">discriminator</span> ),<span class="op">*</span>
}
<span class="macro">enum_from_primitive_impl</span><span class="macro">!</span> { <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>, $( $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span> )<span class="op">+</span> )<span class="op">*</span> }
};
(
$( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">enum_attr</span>:<span class="ident">meta</span>]</span> )<span class="op">*</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span> {
$( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_attr</span>:<span class="ident">meta</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span>:<span class="ident">ident</span> ),<span class="op">+</span> $( <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">discriminator</span>:<span class="ident">expr</span>, $( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_two_attr</span>:<span class="ident">meta</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_two</span>:<span class="ident">ident</span> ),<span class="op">+</span> )<span class="kw-2">*</span>,
}
) <span class="op">=></span> {
$( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">enum_attr</span>]</span> )<span class="op">*</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> {
$( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_attr</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span> ),<span class="op">+</span> $( <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">discriminator</span>, $( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_two_attr</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_two</span> ),<span class="op">+</span> )<span class="kw-2">*</span>,
}
<span class="macro">enum_from_primitive_impl</span><span class="macro">!</span> { <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>, $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span> )<span class="op">+</span> $( $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_two</span> )<span class="op">+</span> )<span class="op">*</span> }
};
(
$( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">enum_attr</span>:<span class="ident">meta</span>]</span> )<span class="op">*</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span> {
$( $( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_attr</span>:<span class="ident">meta</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span>:<span class="ident">ident</span> ),<span class="op">+</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">discriminator</span>:<span class="ident">expr</span> ),<span class="op">+</span>,
}
) <span class="op">=></span> {
$( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">enum_attr</span>]</span> )<span class="op">*</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> {
$( $( $( <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_attr</span>]</span> )<span class="op">*</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span> ),<span class="op">+</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">discriminator</span> ),<span class="op">+</span>,
}
<span class="macro">enum_from_primitive_impl</span><span class="macro">!</span> { <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>, $( $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span> )<span class="op">+</span> )<span class="op">+</span> }
};
}
</pre>
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