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- <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `not` macro in crate `syn`."><meta name="keywords" content="rust, rustlang, rust-lang, not"><title>syn::not - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../dark.css"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script src="../storage.js"></script></head><body class="rustdoc macro"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><div class="sidebar-elems"><p class='location'><a href='index.html'>syn</a></p><script>window.sidebarCurrent = {name: 'not', ty: 'macro', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='in-band'>Macro <a href='index.html'>syn</a>::<wbr><a class="macro" href=''>not</a></span><span class='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../src/syn/parsers.rs.html#238-246' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class="rust macro">
- <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">not</span> {
- (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">submac</span>:<span class="macro">ident</span><span class="macro">!</span>( $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">args</span>:<span class="ident">tt</span>)<span class="op">*</span> )) <span class="op">=></span> { ... };
- }</pre>
- </div><div class='docblock'><p>Invert the result of a parser by parsing successfully if the given parser
- fails to parse and vice versa.</p>
- <p>Does not consume any of the input.</p>
- <ul>
- <li><strong>Syntax:</strong> <code>not!(THING)</code></li>
- <li><strong>Output:</strong> <code>()</code></li>
- </ul>
- <pre class="rust rust-example-rendered">
- <span class="attribute">#[<span class="ident">macro_use</span>]</span>
- <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">syn</span>;
- <span class="kw">use</span> <span class="ident">syn</span>::<span class="ident">Expr</span>;
- <span class="doccomment">/// Parses any expression that does not begin with a `-` minus sign.</span>
- <span class="macro">named</span><span class="macro">!</span>(<span class="ident">not_negative_expr</span> <span class="op">-></span> <span class="ident">Expr</span>, <span class="macro">do_parse</span><span class="macro">!</span>(
- <span class="macro">not</span><span class="macro">!</span>(<span class="macro">punct</span><span class="macro">!</span>(<span class="op">-</span>)) <span class="op">>></span>
- <span class="ident">e</span>: <span class="macro">syn</span><span class="macro">!</span>(<span class="ident">Expr</span>) <span class="op">>></span>
- (<span class="ident">e</span>)
- ));</pre>
- <p><em>This macro is available if Syn is built with the <code>"parsing"</code> feature.</em></p>
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