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152 lines
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<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'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../src/syn/parsers.rs.html#238-246' title='goto source code'>[src]</a></span></h1>
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<pre class="rust macro">
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<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">not</span> {
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(<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> { ... };
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}</pre>
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<div class='docblock'><p>Invert the result of a parser by parsing successfully if the given parser
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fails to parse and vice versa.</p>
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<p>Does not consume any of the input.</p>
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<ul>
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<li><strong>Syntax:</strong> <code>not!(THING)</code></li>
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<li><strong>Output:</strong> <code>()</code></li>
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</ul>
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<pre class="rust rust-example-rendered">
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<span class="attribute">#[<span class="ident">macro_use</span>]</span>
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">syn</span>;
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<span class="kw">use</span> <span class="ident">syn</span>::<span class="ident">Expr</span>;
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<span class="doccomment">/// Parses any expression that does not begin with a `-` minus sign.</span>
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<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>(
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<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>
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<span class="ident">e</span>: <span class="macro">syn</span><span class="macro">!</span>(<span class="ident">Expr</span>) <span class="op">>></span>
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(<span class="ident">e</span>)
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));</pre>
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<p><em>This macro is available if Syn is built with the <code>"parsing"</code> feature.</em></p>
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