<!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="Source to the Rust file `/home/mrh/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.15.39/src/macros.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>macros.rs.html -- source</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><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="shortcut icon" href="../../favicon.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[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><a href='../../syn/index.html'><div class='logo-container'><img src='../../rust-logo.png' alt='logo'></div></a></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"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><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"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><div class="example-wrap"><pre class="rust ">
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"derive"</span>))]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">ast_struct</span> {
(
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span> #<span class="ident">full</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>:<span class="ident">tt</span>)<span class="op">*</span>
) <span class="op">=</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>)]</span>
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>]</span>)<span class="op">*</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extra-traits"</span>, <span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>, <span class="ident">Hash</span>))]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"clone-impls"</span>, <span class="ident">derive</span>(<span class="ident">Clone</span>))]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>)<span class="op">*</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>))]</span>
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>]</span>)<span class="op">*</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extra-traits"</span>, <span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>, <span class="ident">Hash</span>))]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"clone-impls"</span>, <span class="ident">derive</span>(<span class="ident">Clone</span>))]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> {
<span class="ident">_noconstruct</span>: (),
}
};
(
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span> #<span class="ident">manual_extra_traits</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>:<span class="ident">tt</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">attr</span>]</span>)<span class="op">*</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extra-traits"</span>, <span class="ident">derive</span>(<span class="ident">Debug</span>))]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"clone-impls"</span>, <span class="ident">derive</span>(<span class="ident">Clone</span>))]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>)<span class="op">*</span>
};
(
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span>
<span class="kw">pub</span> <span class="kw">struct</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">rest</span>:<span class="ident">tt</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">attr</span>]</span>)<span class="op">*</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extra-traits"</span>, <span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>, <span class="ident">Hash</span>))]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"clone-impls"</span>, <span class="ident">derive</span>(<span class="ident">Clone</span>))]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>)<span class="op">*</span>
};
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"derive"</span>))]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">ast_enum</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> $(# <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tags</span>:<span class="ident">ident</span>)<span class="op">*</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variants</span>:<span class="ident">tt</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="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extra-traits"</span>, <span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>, <span class="ident">Hash</span>))]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"clone-impls"</span>, <span class="ident">derive</span>(<span class="ident">Clone</span>))]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variants</span>)<span class="op">*</span>
}
)
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"derive"</span>))]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">ast_enum_of_structs</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="kw">pub</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span>:<span class="ident">ident</span> $( (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">member</span>:<span class="ident">ident</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) )<span class="kw-2">*</span>,
)<span class="op">*</span>
}
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">remaining</span>:<span class="ident">tt</span>)<span class="op">*</span>
) <span class="op">=</span><span class="op">></span> (
<span class="macro">ast_enum</span><span class="macro">!</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> $( (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">member</span>) )<span class="kw-2">*</span>,
)<span class="op">*</span>
}
}
$(
<span class="macro">maybe_ast_struct</span><span class="macro">!</span> {
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant_attr</span>]</span>)<span class="op">*</span>
$(
<span class="kw">pub</span> <span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">member</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>)<span class="op">*</span>
)<span class="op">*</span>
}
$(
<span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">member</span><span class="op">></span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">e</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">member</span>) <span class="op">-</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">name</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">variant</span>(<span class="ident">e</span>)
}
}
)<span class="op">*</span>
)<span class="op">*</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>)]</span>
<span class="macro">generate_to_tokens</span><span class="macro">!</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">remaining</span>)<span class="op">*</span>
()
<span class="ident">tokens</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="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>)<span class="kw-2">*</span>] )<span class="kw-2">*</span>,)<span class="op">*</span> }
}
)
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>, <span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"derive"</span>)))]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">generate_to_tokens</span> {
(<span class="ident">do_not_generate_to_tokens</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">foo</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> ();
(($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arms</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tokens</span>:<span class="ident">ident</span> <span class="macro-nonterminal">$</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>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">next</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>}) <span class="op">=</span><span class="op">></span> {
<span class="macro">generate_to_tokens</span><span class="macro">!</span>(
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arms</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="op">=</span><span class="op">></span> {})
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tokens</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">next</span>)<span class="op">*</span> }
);
};
(($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arms</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tokens</span>:<span class="ident">ident</span> <span class="macro-nonterminal">$</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="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>], $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">next</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>}) <span class="op">=</span><span class="op">></span> {
<span class="macro">generate_to_tokens</span><span class="macro">!</span>(
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arms</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-2">ref</span> <span class="ident">_e</span>) <span class="op">=</span><span class="op">></span> <span class="macro">to_tokens_call</span><span class="macro">!</span>(<span class="ident">_e</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tokens</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>)<span class="kw-2">*</span>),)
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tokens</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">next</span>)<span class="op">*</span> }
);
};
(($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arms</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tokens</span>:<span class="ident">ident</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span> {}) <span class="op">=</span><span class="op">></span> {
<span class="kw">impl</span> ::<span class="ident">quote</span>::<span class="ident">ToTokens</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> ::<span class="ident">proc_macro2</span>::<span class="ident">TokenStream</span>) {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arms</span>)<span class="op">*</span>
}
}
}
};
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>))]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">to_tokens_call</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tokens</span>:<span class="ident">ident</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> {
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>.<span class="ident">to_tokens</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tokens</span>)
};
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"derive"</span>, <span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>)))]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">to_tokens_call</span> {
<span class="comment">// If the variant is marked as #full, don't auto-generate to-tokens for it.</span>
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tokens</span>:<span class="ident">ident</span>, #<span class="ident">full</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> {
<span class="macro">unreachable</span><span class="macro">!</span>()
};
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tokens</span>:<span class="ident">ident</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> {
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>.<span class="ident">to_tokens</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tokens</span>)
};
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"derive"</span>))]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">maybe_ast_struct</span> {
(
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span>
$(
<span class="kw">pub</span> <span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span>
)<span class="op">*</span>
) <span class="op">=</span><span class="op">></span> ();
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> (<span class="macro">ast_struct</span><span class="macro">!</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>)<span class="op">*</span> });
}
</pre></div>
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