| <!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="This macro is [`parse_quote!`] + [`quote_spanned!`][quote::quote_spanned]."><meta name="keywords" content="rust, rustlang, rust-lang, parse_quote_spanned"><title>parse_quote_spanned in syn - Rust</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" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script src="../crates.js"></script><script defer src="../main.js"></script> |
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| </a><div class="sidebar-elems"><h2 class="location">Other items in<br><a href="index.html">syn</a></h2><div id="sidebar-vars" data-name="parse_quote_spanned" data-ty="macro" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../syn/index.html"><img class="rust-logo" src="../rust-logo.png" alt="logo"></a><nav class="sub"><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../brush.svg"></button><div id="theme-choices" role="menu"></div></div><form class="search-form"><div class="search-container"><div> |
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| <h1 class="fqn"><span class="in-band">Macro <a href="index.html">syn</a>::<wbr><a class="macro" href="#">parse_quote_spanned</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"> |
| <a class="srclink" href="../src/syn/parse_quote.rs.html#102-106" title="goto source code">source</a> · |
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| <div class="docblock item-decl"><div class="example-wrap"><pre class="rust macro"><code><span class="macro">macro_rules!</span> <span class="ident">parse_quote_spanned</span> { |
| (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">span</span> : <span class="ident">expr</span> => $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span> : <span class="ident">tt</span>) <span class="kw-2">*</span>) => { ... }; |
| }</code></pre></div> |
| </div><div class="item-info"><div class="stab portability">This is supported on <strong>crate features <code>parsing</code> and <code>printing</code></strong> only.</div></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>This macro is <a href="macro.parse_quote.html" title="parse_quote!"><code>parse_quote!</code></a> + <a href="../quote/macro.quote_spanned.html" title="quote::quote_spanned"><code>quote_spanned!</code></a>.</p> |
| <p>Please refer to each of their documentation.</p> |
| <h2 id="example" class="section-header"><a href="#example">Example</a></h2> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">quote</span>::{<span class="ident">quote</span>, <span class="ident">quote_spanned</span>}; |
| <span class="kw">use</span> <span class="ident">syn::spanned::Spanned</span>; |
| <span class="kw">use</span> <span class="ident">syn</span>::{<span class="ident">parse_quote_spanned</span>, <span class="ident">ReturnType</span>, <span class="ident">Signature</span>}; |
| |
| <span class="comment">// Changes `fn()` to `fn() -> Pin<Box<dyn Future<Output = ()>>>`,</span> |
| <span class="comment">// and `fn() -> T` to `fn() -> Pin<Box<dyn Future<Output = T>>>`,</span> |
| <span class="comment">// without introducing any call_site() spans.</span> |
| <span class="kw">fn</span> <span class="ident">make_ret_pinned_future</span>(<span class="ident">sig</span>: <span class="kw-2">&mut</span> <span class="ident">Signature</span>) { |
| <span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">&</span><span class="ident">sig</span>.<span class="ident">output</span> { |
| <span class="ident">ReturnType::Default</span> => <span class="macro">quote_spanned!</span>(<span class="ident">sig</span>.<span class="ident">paren_token</span>.<span class="ident">span</span>=> ()), |
| <span class="ident">ReturnType::Type</span>(<span class="kw">_</span>, <span class="ident">ret</span>) => <span class="macro">quote!</span>(#<span class="ident">ret</span>), |
| }; |
| <span class="ident">sig</span>.<span class="ident">output</span> <span class="op">=</span> <span class="macro">parse_quote_spanned!</span> {<span class="ident">ret</span>.<span class="ident">span</span>()=> |
| -> <span class="ident">::std::pin::Pin</span><span class="op"><</span><span class="ident">::std::boxed::Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">::std::future::Future</span><span class="op"><</span><span class="ident">Output</span> <span class="op">=</span> #<span class="ident">ret</span><span class="op">></span><span class="op">></span><span class="op">></span> |
| }; |
| }</code></pre></div> |
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