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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="A wrapper around the procedural macro API of the compiler’s `proc_macro` crate. This library serves two purposes:"><meta name="keywords" content="rust, rustlang, rust-lang, proc_macro2"><title>proc_macro2 - 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="../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../ayu.css" disabled ><script id="default-settings"></script><script src="../storage.js"></script><script src="../crates.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../favicon.svg">
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<link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc mod"><!--[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" role="button">☰</div><a href='../proc_macro2/index.html'><div class='logo-container rust-logo'><img src='../rust-logo.png' alt='logo'></div></a><p class="location">Crate proc_macro2</p><div class="block version"><p>Version 1.0.27</p></div><div class="sidebar-elems"><a id="all-types" href="all.html"><p>See all proc_macro2's items</p></a><div class="block items"><ul><li><a href="#modules">Modules</a></li><li><a href="#structs">Structs</a></li><li><a href="#enums">Enums</a></li></ul></div><p class="location"></p><div id="sidebar-vars" data-name="proc_macro2" data-ty="mod" data-relpath="../"></div></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../brush.svg" width="18" height="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" class="help-button">?</button>
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<a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" height="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Crate <a class="mod" href="">proc_macro2</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/proc_macro2/lib.rs.html#1-1272" title="goto source code">[src]</a></span></h1><div class="docblock"><p>A wrapper around the procedural macro API of the compiler’s <a href="https://doc.rust-lang.org/proc_macro/"><code>proc_macro</code></a>
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<link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">☰</div><a href='../proc_macro2/index.html'><div class='logo-container rust-logo'><img src='../rust-logo.png' alt='logo'></div></a><p class="location">Crate proc_macro2</p><div class="block version"><p>Version 1.0.27</p></div><div class="sidebar-elems"><a id="all-types" href="all.html"><p>See all proc_macro2's items</p></a><div class="block items"><ul><li><a href="#modules">Modules</a></li><li><a href="#structs">Structs</a></li><li><a href="#enums">Enums</a></li></ul></div><p class="location"></p><div id="sidebar-vars" data-name="proc_macro2" data-ty="mod" data-relpath="../"></div><script defer src="../sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../brush.svg" width="18" height="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" class="help-button">?</button>
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<a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" height="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Crate <a class="mod" href="">proc_macro2</a><button id="copy-path" onclick="copy_path(this)">⎘</button></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/proc_macro2/lib.rs.html#1-1272" title="goto source code">[src]</a></span></h1><div class="docblock"><p>A wrapper around the procedural macro API of the compiler’s <a href="https://doc.rust-lang.org/proc_macro/"><code>proc_macro</code></a>
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crate. This library serves two purposes:</p>
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<ul>
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<li>
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@@ -29,14 +29,14 @@ a macro to be testable in isolation, they must be implemented using
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">proc_macro</span>;
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<span class="attribute">#[<span class="ident">proc_macro_derive</span>(<span class="ident">MyDerive</span>)]</span>
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<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">my_derive</span>(<span class="ident">input</span>: <span class="ident">proc_macro</span>::<span class="ident">TokenStream</span>) <span class="op">-</span><span class="op">></span> <span class="ident">proc_macro</span>::<span class="ident">TokenStream</span> {
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<span class="kw">let</span> <span class="ident">input</span> <span class="op">=</span> <span class="ident">proc_macro2</span>::<span class="ident">TokenStream</span>::<span class="ident">from</span>(<span class="ident">input</span>);
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<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">my_derive</span>(<span class="ident">input</span>: <span class="ident">proc_macro::TokenStream</span>) <span class="op">-</span><span class="op">></span> <span class="ident">proc_macro::TokenStream</span> {
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<span class="kw">let</span> <span class="ident">input</span> <span class="op">=</span> <span class="ident">proc_macro2::TokenStream::from</span>(<span class="ident">input</span>);
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<span class="kw">let</span> <span class="ident">output</span>: <span class="ident">proc_macro2</span>::<span class="ident">TokenStream</span> <span class="op">=</span> {
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<span class="kw">let</span> <span class="ident">output</span>: <span class="ident">proc_macro2::TokenStream</span> <span class="op">=</span> {
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<span class="comment">/* transform input */</span>
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};
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<span class="ident">proc_macro</span>::<span class="ident">TokenStream</span>::<span class="ident">from</span>(<span class="ident">output</span>)
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<span class="ident">proc_macro::TokenStream::from</span>(<span class="ident">output</span>)
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}</pre></div>
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<p>If parsing with <a href="https://github.com/dtolnay/syn">Syn</a>, you’ll use <a href="https://docs.rs/syn/1.0/syn/macro.parse_macro_input.html"><code>parse_macro_input!</code></a> instead to
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propagate parse errors correctly back to the compiler when parsing fails.</p>
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@@ -76,5 +76,5 @@ a suffix (<code>1</code>, <code>1u8</code>, <code>2.3</code>, <code>2.3f32</code
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</td></tr><tr class="module-item"><td><a class="enum" href="enum.Spacing.html" title="proc_macro2::Spacing enum">Spacing</a></td><td class="docblock-short"><p>Whether a <code>Punct</code> is followed immediately by another <code>Punct</code> or followed by
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another token or whitespace.</p>
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</td></tr><tr class="module-item"><td><a class="enum" href="enum.TokenTree.html" title="proc_macro2::TokenTree enum">TokenTree</a></td><td class="docblock-short"><p>A single token or a delimited sequence of token trees (e.g. <code>[1, (), ..]</code>).</p>
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