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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="Source of the Rust file `/home/sangenya/.cargo/registry/src/github.com-1ecc6299db9ec823/rayon-1.5.1/src/compile_fail/must_use.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>must_use.rs - 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="../../../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 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"><div class="sidebar-menu" role="button">&#9776;</div><a href='../../../rayon/index.html'><div class='logo-container rust-logo'><img src='../../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><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" id="help-button" title="help">?</button><a id="settings-menu" href="../../../settings.html" title="settings"><img src="../../../wheel.svg" width="18" height="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><div class="example-wrap"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class="rust">
<span class="comment">// Check that we are flagged for ignoring `must_use` parallel adaptors.</span>
<span class="comment">// (unfortunately there&#39;s no error code for `unused_must_use`)</span>

<span class="macro">macro_rules!</span> <span class="ident">must_use</span> {
    ($( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span> <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span>:<span class="ident">meta</span>]</span> )<span class="kw-2">*</span>) <span class="op">=</span><span class="op">&gt;</span> {$(
        <span class="doccomment">/// First sanity check that the expression is OK.</span>
        <span class="doccomment">///</span>
        <span class="doccomment">/// ```</span>
        <span class="doccomment">/// #![deny(unused_must_use)]</span>
        <span class="doccomment">///</span>
        <span class="doccomment">/// use rayon::prelude::*;</span>
        <span class="doccomment">///</span>
        <span class="doccomment">/// let v: Vec&lt;_&gt; = (0..100).map(Some).collect();</span>
        <span class="doccomment">/// let _ =</span>
        <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span>]</span>
        <span class="doccomment">/// ```</span>
        <span class="doccomment">///</span>
        <span class="doccomment">/// Now trigger the `must_use`.</span>
        <span class="doccomment">///</span>
        <span class="doccomment">/// ```compile_fail</span>
        <span class="doccomment">/// #![deny(unused_must_use)]</span>
        <span class="doccomment">///</span>
        <span class="doccomment">/// use rayon::prelude::*;</span>
        <span class="doccomment">///</span>
        <span class="doccomment">/// let v: Vec&lt;_&gt; = (0..100).map(Some).collect();</span>
        <span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span>]</span>
        <span class="doccomment">/// ```</span>
        <span class="kw">mod</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> {}
    )<span class="kw-2">*</span>}
}

<span class="macro">must_use!</span> {
    <span class="ident">step_by</span>             <span class="doccomment">/** v.par_iter().step_by(2); */</span>
    <span class="ident">chain</span>               <span class="doccomment">/** v.par_iter().chain(&amp;v); */</span>
    <span class="ident">chunks</span>              <span class="doccomment">/** v.par_iter().chunks(2); */</span>
    <span class="ident">cloned</span>              <span class="doccomment">/** v.par_iter().cloned(); */</span>
    <span class="ident">copied</span>              <span class="doccomment">/** v.par_iter().copied(); */</span>
    <span class="ident">enumerate</span>           <span class="doccomment">/** v.par_iter().enumerate(); */</span>
    <span class="ident">filter</span>              <span class="doccomment">/** v.par_iter().filter(|_| true); */</span>
    <span class="ident">filter_map</span>          <span class="doccomment">/** v.par_iter().filter_map(|x| *x); */</span>
    <span class="ident">flat_map</span>            <span class="doccomment">/** v.par_iter().flat_map(|x| *x); */</span>
    <span class="ident">flat_map_iter</span>       <span class="doccomment">/** v.par_iter().flat_map_iter(|x| *x); */</span>
    <span class="ident">flatten</span>             <span class="doccomment">/** v.par_iter().flatten(); */</span>
    <span class="ident">flatten_iter</span>        <span class="doccomment">/** v.par_iter().flatten_iter(); */</span>
    <span class="ident">fold</span>                <span class="doccomment">/** v.par_iter().fold(|| 0, |x, _| x); */</span>
    <span class="ident">fold_with</span>           <span class="doccomment">/** v.par_iter().fold_with(0, |x, _| x); */</span>
    <span class="ident">try_fold</span>            <span class="doccomment">/** v.par_iter().try_fold(|| 0, |x, _| Some(x)); */</span>
    <span class="ident">try_fold_with</span>       <span class="doccomment">/** v.par_iter().try_fold_with(0, |x, _| Some(x)); */</span>
    <span class="ident">inspect</span>             <span class="doccomment">/** v.par_iter().inspect(|_| {}); */</span>
    <span class="ident">interleave</span>          <span class="doccomment">/** v.par_iter().interleave(&amp;v); */</span>
    <span class="ident">interleave_shortest</span> <span class="doccomment">/** v.par_iter().interleave_shortest(&amp;v); */</span>
    <span class="ident">intersperse</span>         <span class="doccomment">/** v.par_iter().intersperse(&amp;None); */</span>
    <span class="ident">map</span>                 <span class="doccomment">/** v.par_iter().map(|x| x); */</span>
    <span class="ident">map_with</span>            <span class="doccomment">/** v.par_iter().map_with(0, |_, x| x); */</span>
    <span class="ident">map_init</span>            <span class="doccomment">/** v.par_iter().map_init(|| 0, |_, x| x); */</span>
    <span class="ident">panic_fuse</span>          <span class="doccomment">/** v.par_iter().panic_fuse(); */</span>
    <span class="ident">positions</span>           <span class="doccomment">/** v.par_iter().positions(|_| true); */</span>
    <span class="ident">rev</span>                 <span class="doccomment">/** v.par_iter().rev(); */</span>
    <span class="ident">skip</span>                <span class="doccomment">/** v.par_iter().skip(1); */</span>
    <span class="ident">take</span>                <span class="doccomment">/** v.par_iter().take(1); */</span>
    <span class="ident">update</span>              <span class="doccomment">/** v.par_iter().update(|_| {}); */</span>
    <span class="ident">while_some</span>          <span class="doccomment">/** v.par_iter().cloned().while_some(); */</span>
    <span class="ident">with_max_len</span>        <span class="doccomment">/** v.par_iter().with_max_len(1); */</span>
    <span class="ident">with_min_len</span>        <span class="doccomment">/** v.par_iter().with_min_len(1); */</span>
    <span class="ident">zip</span>                 <span class="doccomment">/** v.par_iter().zip(&amp;v); */</span>
    <span class="ident">zip_eq</span>              <span class="doccomment">/** v.par_iter().zip_eq(&amp;v); */</span>
}
</pre></div>
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