| <!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 of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-2.0.18/src/macros.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>macros.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../syn/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../syn/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
| <span id="2">2</span> |
| <span id="3">3</span> |
| <span id="4">4</span> |
| <span id="5">5</span> |
| <span id="6">6</span> |
| <span id="7">7</span> |
| <span id="8">8</span> |
| <span id="9">9</span> |
| <span id="10">10</span> |
| <span id="11">11</span> |
| <span id="12">12</span> |
| <span id="13">13</span> |
| <span id="14">14</span> |
| <span id="15">15</span> |
| <span id="16">16</span> |
| <span id="17">17</span> |
| <span id="18">18</span> |
| <span id="19">19</span> |
| <span id="20">20</span> |
| <span id="21">21</span> |
| <span id="22">22</span> |
| <span id="23">23</span> |
| <span id="24">24</span> |
| <span id="25">25</span> |
| <span id="26">26</span> |
| <span id="27">27</span> |
| <span id="28">28</span> |
| <span id="29">29</span> |
| <span id="30">30</span> |
| <span id="31">31</span> |
| <span id="32">32</span> |
| <span id="33">33</span> |
| <span id="34">34</span> |
| <span id="35">35</span> |
| <span id="36">36</span> |
| <span id="37">37</span> |
| <span id="38">38</span> |
| <span id="39">39</span> |
| <span id="40">40</span> |
| <span id="41">41</span> |
| <span id="42">42</span> |
| <span id="43">43</span> |
| <span id="44">44</span> |
| <span id="45">45</span> |
| <span id="46">46</span> |
| <span id="47">47</span> |
| <span id="48">48</span> |
| <span id="49">49</span> |
| <span id="50">50</span> |
| <span id="51">51</span> |
| <span id="52">52</span> |
| <span id="53">53</span> |
| <span id="54">54</span> |
| <span id="55">55</span> |
| <span id="56">56</span> |
| <span id="57">57</span> |
| <span id="58">58</span> |
| <span id="59">59</span> |
| <span id="60">60</span> |
| <span id="61">61</span> |
| <span id="62">62</span> |
| <span id="63">63</span> |
| <span id="64">64</span> |
| <span id="65">65</span> |
| <span id="66">66</span> |
| <span id="67">67</span> |
| <span id="68">68</span> |
| <span id="69">69</span> |
| <span id="70">70</span> |
| <span id="71">71</span> |
| <span id="72">72</span> |
| <span id="73">73</span> |
| <span id="74">74</span> |
| <span id="75">75</span> |
| <span id="76">76</span> |
| <span id="77">77</span> |
| <span id="78">78</span> |
| <span id="79">79</span> |
| <span id="80">80</span> |
| <span id="81">81</span> |
| <span id="82">82</span> |
| <span id="83">83</span> |
| <span id="84">84</span> |
| <span id="85">85</span> |
| <span id="86">86</span> |
| <span id="87">87</span> |
| <span id="88">88</span> |
| <span id="89">89</span> |
| <span id="90">90</span> |
| <span id="91">91</span> |
| <span id="92">92</span> |
| <span id="93">93</span> |
| <span id="94">94</span> |
| <span id="95">95</span> |
| <span id="96">96</span> |
| <span id="97">97</span> |
| <span id="98">98</span> |
| <span id="99">99</span> |
| <span id="100">100</span> |
| <span id="101">101</span> |
| <span id="102">102</span> |
| <span id="103">103</span> |
| <span id="104">104</span> |
| <span id="105">105</span> |
| <span id="106">106</span> |
| <span id="107">107</span> |
| <span id="108">108</span> |
| <span id="109">109</span> |
| <span id="110">110</span> |
| <span id="111">111</span> |
| <span id="112">112</span> |
| <span id="113">113</span> |
| <span id="114">114</span> |
| <span id="115">115</span> |
| <span id="116">116</span> |
| <span id="117">117</span> |
| <span id="118">118</span> |
| <span id="119">119</span> |
| <span id="120">120</span> |
| <span id="121">121</span> |
| <span id="122">122</span> |
| <span id="123">123</span> |
| <span id="124">124</span> |
| <span id="125">125</span> |
| <span id="126">126</span> |
| <span id="127">127</span> |
| <span id="128">128</span> |
| <span id="129">129</span> |
| <span id="130">130</span> |
| <span id="131">131</span> |
| <span id="132">132</span> |
| <span id="133">133</span> |
| <span id="134">134</span> |
| <span id="135">135</span> |
| <span id="136">136</span> |
| <span id="137">137</span> |
| <span id="138">138</span> |
| <span id="139">139</span> |
| <span id="140">140</span> |
| <span id="141">141</span> |
| <span id="142">142</span> |
| <span id="143">143</span> |
| <span id="144">144</span> |
| <span id="145">145</span> |
| <span id="146">146</span> |
| <span id="147">147</span> |
| <span id="148">148</span> |
| <span id="149">149</span> |
| <span id="150">150</span> |
| <span id="151">151</span> |
| <span id="152">152</span> |
| <span id="153">153</span> |
| <span id="154">154</span> |
| <span id="155">155</span> |
| <span id="156">156</span> |
| <span id="157">157</span> |
| <span id="158">158</span> |
| <span id="159">159</span> |
| <span id="160">160</span> |
| <span id="161">161</span> |
| <span id="162">162</span> |
| <span id="163">163</span> |
| <span id="164">164</span> |
| <span id="165">165</span> |
| <span id="166">166</span> |
| <span id="167">167</span> |
| <span id="168">168</span> |
| </pre><pre class="rust"><code><span class="attribute">#[cfg_attr( |
| not(any(feature = <span class="string">"full"</span>, feature = <span class="string">"derive"</span>)), |
| allow(unknown_lints, unused_macro_rules) |
| )] |
| </span><span class="macro">macro_rules! </span>ast_struct { |
| ( |
| [$(<span class="macro-nonterminal">$attrs_pub</span>:tt)<span class="kw-2">*</span>] |
| <span class="kw">struct </span><span class="macro-nonterminal">$name</span>:ident #full $(<span class="macro-nonterminal">$rest</span>:tt)* |
| ) => { |
| <span class="attribute">#[cfg(feature = <span class="string">"full"</span>)] |
| </span>$(<span class="macro-nonterminal">$attrs_pub</span>)* <span class="kw">struct </span><span class="macro-nonterminal">$name </span>$(<span class="macro-nonterminal">$rest</span>)* |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"full"</span>))] |
| </span>$(<span class="macro-nonterminal">$attrs_pub</span>)* <span class="kw">struct </span><span class="macro-nonterminal">$name </span>{ |
| _noconstruct: ::std::marker::PhantomData<::proc_macro2::Span>, |
| } |
| |
| <span class="attribute">#[cfg(all(not(feature = <span class="string">"full"</span>), feature = <span class="string">"printing"</span>))] |
| </span><span class="kw">impl </span>::quote::ToTokens <span class="kw">for </span><span class="macro-nonterminal">$name </span>{ |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&mut </span>::proc_macro2::TokenStream) { |
| <span class="macro">unreachable!</span>() |
| } |
| } |
| }; |
| |
| ( |
| [$(<span class="macro-nonterminal">$attrs_pub</span>:tt)<span class="kw-2">*</span>] |
| <span class="kw">struct </span><span class="macro-nonterminal">$name</span>:ident $(<span class="macro-nonterminal">$rest</span>:tt)* |
| ) => { |
| $(<span class="macro-nonterminal">$attrs_pub</span>)* <span class="kw">struct </span><span class="macro-nonterminal">$name </span>$(<span class="macro-nonterminal">$rest</span>)* |
| }; |
| |
| ($(<span class="macro-nonterminal">$t</span>:tt)<span class="kw-2">*</span>) => { |
| <span class="macro">strip_attrs_pub!</span>(<span class="macro">ast_struct!</span>($(<span class="macro-nonterminal">$t</span>)<span class="kw-2">*</span>)); |
| }; |
| } |
| |
| <span class="macro">macro_rules! </span>ast_enum { |
| <span class="comment">// Drop the `#no_visit` attribute, if present. |
| </span>( |
| [$(<span class="macro-nonterminal">$attrs_pub</span>:tt)<span class="kw-2">*</span>] |
| <span class="kw">enum </span><span class="macro-nonterminal">$name</span>:ident #no_visit $(<span class="macro-nonterminal">$rest</span>:tt)* |
| ) => ( |
| <span class="macro">ast_enum!</span>([$(<span class="macro-nonterminal">$attrs_pub</span>)<span class="kw-2">*</span>] <span class="kw">enum </span><span class="macro-nonterminal">$name </span>$(<span class="macro-nonterminal">$rest</span>)<span class="kw-2">*</span>); |
| ); |
| |
| ( |
| [$(<span class="macro-nonterminal">$attrs_pub</span>:tt)<span class="kw-2">*</span>] |
| <span class="kw">enum </span><span class="macro-nonterminal">$name</span>:ident $(<span class="macro-nonterminal">$rest</span>:tt)* |
| ) => ( |
| $(<span class="macro-nonterminal">$attrs_pub</span>)* <span class="kw">enum </span><span class="macro-nonterminal">$name </span>$(<span class="macro-nonterminal">$rest</span>)* |
| ); |
| |
| ($(<span class="macro-nonterminal">$t</span>:tt)<span class="kw-2">*</span>) => { |
| <span class="macro">strip_attrs_pub!</span>(<span class="macro">ast_enum!</span>($(<span class="macro-nonterminal">$t</span>)<span class="kw-2">*</span>)); |
| }; |
| } |
| |
| <span class="macro">macro_rules! </span>ast_enum_of_structs { |
| ( |
| $(<span class="attribute">#[<span class="macro-nonterminal">$enum_attr</span>:meta]</span>)* |
| <span class="macro-nonterminal">$</span><span class="kw">pub</span>:<span class="macro-nonterminal">ident $</span><span class="kw">enum</span>:<span class="macro-nonterminal">ident $name</span>:ident <span class="macro-nonterminal">$body</span>:tt |
| $(<span class="macro-nonterminal">$remaining</span>:tt)* |
| ) => { |
| <span class="macro">ast_enum!</span>($(<span class="attribute">#[<span class="macro-nonterminal">$enum_attr</span>]</span>)* <span class="macro-nonterminal">$</span><span class="kw">pub </span><span class="macro-nonterminal">$</span><span class="kw">enum </span><span class="macro-nonterminal">$name $body</span>); |
| <span class="macro">ast_enum_of_structs_impl!</span>(<span class="macro-nonterminal">$</span><span class="kw">pub </span><span class="macro-nonterminal">$</span><span class="kw">enum </span><span class="macro-nonterminal">$name $body </span>$(<span class="macro-nonterminal">$remaining</span>)<span class="kw-2">*</span>); |
| }; |
| } |
| |
| <span class="macro">macro_rules! </span>ast_enum_of_structs_impl { |
| ( |
| <span class="macro-nonterminal">$</span><span class="kw">pub</span>:<span class="macro-nonterminal">ident $</span><span class="kw">enum</span>:<span class="macro-nonterminal">ident $name</span>:ident { |
| $( |
| $(<span class="attribute">#[cfg <span class="macro-nonterminal">$cfg_attr</span>:tt]</span>)* |
| $(<span class="attribute">#[doc $(<span class="macro-nonterminal">$doc_attr</span>:tt)<span class="kw-2">*</span>]</span>)* |
| <span class="macro-nonterminal">$variant</span>:ident $( ($(<span class="macro-nonterminal">$member</span>:ident)::+) )<span class="kw-2">*</span>, |
| )* |
| } |
| ) => { |
| <span class="macro">check_keyword_matches!</span>(<span class="kw">pub </span><span class="macro-nonterminal">$</span><span class="kw">pub</span>); |
| <span class="macro">check_keyword_matches!</span>(<span class="kw">enum </span><span class="macro-nonterminal">$</span><span class="kw">enum</span>); |
| |
| $($( |
| <span class="macro">ast_enum_from_struct!</span>(<span class="macro-nonterminal">$name</span>::<span class="macro-nonterminal">$variant</span>, $(<span class="macro-nonterminal">$member</span>)::+); |
| )<span class="kw-2">*</span>)* |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"printing"</span>)] |
| </span><span class="macro">generate_to_tokens! </span>{ |
| () |
| tokens |
| <span class="macro-nonterminal">$name </span>{ |
| $( |
| $(<span class="attribute">#[cfg <span class="macro-nonterminal">$cfg_attr</span>]</span>)* |
| $(<span class="attribute">#[doc $(<span class="macro-nonterminal">$doc_attr</span>)<span class="kw-2">*</span>]</span>)* |
| <span class="macro-nonterminal">$variant </span>$($(<span class="macro-nonterminal">$member</span>)::+)<span class="kw-2">*</span>, |
| )* |
| } |
| } |
| }; |
| } |
| |
| <span class="macro">macro_rules! </span>ast_enum_from_struct { |
| <span class="comment">// No From<TokenStream> for verbatim variants. |
| </span>(<span class="macro-nonterminal">$name</span>:ident::Verbatim, <span class="macro-nonterminal">$member</span>:ident) => {}; |
| |
| (<span class="macro-nonterminal">$name</span>:ident::<span class="macro-nonterminal">$variant</span>:ident, <span class="macro-nonterminal">$member</span>:ident) => { |
| <span class="kw">impl </span>From<<span class="macro-nonterminal">$member</span>> <span class="kw">for </span><span class="macro-nonterminal">$name </span>{ |
| <span class="kw">fn </span>from(e: <span class="macro-nonterminal">$member</span>) -> <span class="macro-nonterminal">$name </span>{ |
| <span class="macro-nonterminal">$name</span>::<span class="macro-nonterminal">$variant</span>(e) |
| } |
| } |
| }; |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"printing"</span>)] |
| </span><span class="macro">macro_rules! </span>generate_to_tokens { |
| ( |
| ($(<span class="macro-nonterminal">$arms</span>:tt)<span class="kw-2">*</span>) <span class="macro-nonterminal">$tokens</span>:ident <span class="macro-nonterminal">$name</span>:ident { |
| $(<span class="attribute">#[cfg <span class="macro-nonterminal">$cfg_attr</span>:tt]</span>)* |
| $(<span class="attribute">#[doc $(<span class="macro-nonterminal">$doc_attr</span>:tt)<span class="kw-2">*</span>]</span>)* |
| <span class="macro-nonterminal">$variant</span>:ident, |
| $(<span class="macro-nonterminal">$next</span>:tt)* |
| } |
| ) => { |
| <span class="macro">generate_to_tokens!</span>( |
| ($(<span class="macro-nonterminal">$arms</span>)* $(<span class="attribute">#[cfg <span class="macro-nonterminal">$cfg_attr</span>]</span>)* <span class="macro-nonterminal">$name</span>::<span class="macro-nonterminal">$variant </span>=> {}) |
| <span class="macro-nonterminal">$tokens $name </span>{ $(<span class="macro-nonterminal">$next</span>)* } |
| ); |
| }; |
| |
| ( |
| ($(<span class="macro-nonterminal">$arms</span>:tt)<span class="kw-2">*</span>) <span class="macro-nonterminal">$tokens</span>:ident <span class="macro-nonterminal">$name</span>:ident { |
| $(<span class="attribute">#[cfg <span class="macro-nonterminal">$cfg_attr</span>:tt]</span>)* |
| $(<span class="attribute">#[doc $(<span class="macro-nonterminal">$doc_attr</span>:tt)<span class="kw-2">*</span>]</span>)* |
| <span class="macro-nonterminal">$variant</span>:ident <span class="macro-nonterminal">$member</span>:ident, |
| $(<span class="macro-nonterminal">$next</span>:tt)* |
| } |
| ) => { |
| <span class="macro">generate_to_tokens!</span>( |
| ($(<span class="macro-nonterminal">$arms</span>)* $(<span class="attribute">#[cfg <span class="macro-nonterminal">$cfg_attr</span>]</span>)* <span class="macro-nonterminal">$name</span>::<span class="macro-nonterminal">$variant</span>(_e) => _e.to_tokens(<span class="macro-nonterminal">$tokens</span>),) |
| <span class="macro-nonterminal">$tokens $name </span>{ $(<span class="macro-nonterminal">$next</span>)* } |
| ); |
| }; |
| |
| (($(<span class="macro-nonterminal">$arms</span>:tt)<span class="kw-2">*</span>) <span class="macro-nonterminal">$tokens</span>:ident <span class="macro-nonterminal">$name</span>:ident {}) => { |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>::quote::ToTokens <span class="kw">for </span><span class="macro-nonterminal">$name </span>{ |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, <span class="macro-nonterminal">$tokens</span>: <span class="kw-2">&mut </span>::proc_macro2::TokenStream) { |
| <span class="kw">match </span><span class="self">self </span>{ |
| $(<span class="macro-nonterminal">$arms</span>)* |
| } |
| } |
| } |
| }; |
| } |
| |
| <span class="macro">macro_rules! </span>strip_attrs_pub { |
| (<span class="macro-nonterminal">$mac</span>:<span class="macro">ident!</span>($(<span class="attribute">#[<span class="macro-nonterminal">$m</span>:meta]</span>)* <span class="macro-nonterminal">$</span><span class="kw">pub</span>:<span class="macro-nonterminal">ident </span>$(<span class="macro-nonterminal">$t</span>:tt)<span class="kw-2">*</span>)) => { |
| <span class="macro">check_keyword_matches!</span>(<span class="kw">pub </span><span class="macro-nonterminal">$</span><span class="kw">pub</span>); |
| |
| <span class="macro-nonterminal">$</span><span class="macro">mac!</span>([$(<span class="attribute">#[<span class="macro-nonterminal">$m</span>]</span>)* <span class="macro-nonterminal">$</span><span class="kw">pub</span>] $(<span class="macro-nonterminal">$t</span>)<span class="kw-2">*</span>); |
| }; |
| } |
| |
| <span class="macro">macro_rules! </span>check_keyword_matches { |
| (<span class="kw">enum enum</span>) => {}; |
| (<span class="kw">pub pub</span>) => {}; |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="syn" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |