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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/newkirk/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/futures-macro-0.3.32/src/executor.rs`."><title>executor.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="futures_macro" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="../../static.files/src-script-813739b1.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[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="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">futures_macro/</div>executor.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-2"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="kw">use </span>proc_macro::TokenStream;
<a href=#2 id=2 data-nosnippet>2</a><span class="kw">use </span>proc_macro2::Span;
<a href=#3 id=3 data-nosnippet>3</a><span class="kw">use </span>quote::{quote, quote_spanned, ToTokens};
<a href=#4 id=4 data-nosnippet>4</a>
<a href=#5 id=5 data-nosnippet>5</a><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>test(args: TokenStream, item: TokenStream) -&gt; TokenStream {
<a href=#6 id=6 data-nosnippet>6</a> <span class="kw">if </span>!args.is_empty() {
<a href=#7 id=7 data-nosnippet>7</a> <span class="kw">return </span>syn::Error::new_spanned(proc_macro2::TokenStream::from(args), <span class="string">"invalid argument"</span>)
<a href=#8 id=8 data-nosnippet>8</a> .to_compile_error()
<a href=#9 id=9 data-nosnippet>9</a> .into();
<a href=#10 id=10 data-nosnippet>10</a> }
<a href=#11 id=11 data-nosnippet>11</a>
<a href=#12 id=12 data-nosnippet>12</a> <span class="kw">let </span><span class="kw-2">mut </span>input = <span class="macro">syn::parse_macro_input!</span>(item <span class="kw">as </span>syn::ItemFn);
<a href=#13 id=13 data-nosnippet>13</a>
<a href=#14 id=14 data-nosnippet>14</a> <span class="kw">if </span>input.sig.asyncness.take().is_none() {
<a href=#15 id=15 data-nosnippet>15</a> <span class="kw">return </span>syn::Error::new_spanned(input.sig.fn_token, <span class="string">"Only async functions are supported"</span>)
<a href=#16 id=16 data-nosnippet>16</a> .to_compile_error()
<a href=#17 id=17 data-nosnippet>17</a> .into();
<a href=#18 id=18 data-nosnippet>18</a> }
<a href=#19 id=19 data-nosnippet>19</a>
<a href=#20 id=20 data-nosnippet>20</a> <span class="comment">// If type mismatch occurs, the current rustc points to the last statement.
<a href=#21 id=21 data-nosnippet>21</a> </span><span class="kw">let </span>(last_stmt_start_span, last_stmt_end_span) = {
<a href=#22 id=22 data-nosnippet>22</a> <span class="kw">let </span><span class="kw-2">mut </span>last_stmt = input
<a href=#23 id=23 data-nosnippet>23</a> .block
<a href=#24 id=24 data-nosnippet>24</a> .stmts
<a href=#25 id=25 data-nosnippet>25</a> .last()
<a href=#26 id=26 data-nosnippet>26</a> .map(ToTokens::into_token_stream)
<a href=#27 id=27 data-nosnippet>27</a> .unwrap_or_default()
<a href=#28 id=28 data-nosnippet>28</a> .into_iter();
<a href=#29 id=29 data-nosnippet>29</a> <span class="comment">// `Span` on stable Rust has a limitation that only points to the first
<a href=#30 id=30 data-nosnippet>30</a> // token, not the whole tokens. We can work around this limitation by
<a href=#31 id=31 data-nosnippet>31</a> // using the first/last span of the tokens like
<a href=#32 id=32 data-nosnippet>32</a> // `syn::Error::new_spanned` does.
<a href=#33 id=33 data-nosnippet>33</a> </span><span class="kw">let </span>start = last_stmt.next().map_or_else(Span::call_site, |t| t.span());
<a href=#34 id=34 data-nosnippet>34</a> <span class="kw">let </span>end = last_stmt.last().map_or(start, |t| t.span());
<a href=#35 id=35 data-nosnippet>35</a> (start, end)
<a href=#36 id=36 data-nosnippet>36</a> };
<a href=#37 id=37 data-nosnippet>37</a>
<a href=#38 id=38 data-nosnippet>38</a> <span class="kw">let </span>path = <span class="macro">quote_spanned!</span> {last_stmt_start_span=&gt;
<a href=#39 id=39 data-nosnippet>39</a> ::futures_test::__private
<a href=#40 id=40 data-nosnippet>40</a> };
<a href=#41 id=41 data-nosnippet>41</a> <span class="kw">let </span>body = <span class="kw-2">&amp;</span>input.block;
<a href=#42 id=42 data-nosnippet>42</a> input.block.stmts = <span class="macro">vec!</span>[syn::Stmt::Expr(
<a href=#43 id=43 data-nosnippet>43</a> syn::parse2(<span class="macro">quote_spanned!</span> {last_stmt_end_span=&gt;
<a href=#44 id=44 data-nosnippet>44</a> #path::block_on(<span class="kw">async </span>#body)
<a href=#45 id=45 data-nosnippet>45</a> })
<a href=#46 id=46 data-nosnippet>46</a> .unwrap(),
<a href=#47 id=47 data-nosnippet>47</a> <span class="prelude-val">None</span>,
<a href=#48 id=48 data-nosnippet>48</a> )];
<a href=#49 id=49 data-nosnippet>49</a>
<a href=#50 id=50 data-nosnippet>50</a> <span class="kw">let gen </span>= <span class="macro">quote!</span> {
<a href=#51 id=51 data-nosnippet>51</a> <span class="attr">#[::core::prelude::v1::test]
<a href=#52 id=52 data-nosnippet>52</a> </span>#input
<a href=#53 id=53 data-nosnippet>53</a> };
<a href=#54 id=54 data-nosnippet>54</a>
<a href=#55 id=55 data-nosnippet>55</a> <span class="kw">gen</span>.into()
<a href=#56 id=56 data-nosnippet>56</a>}
</code></pre></div></section></main></body></html>

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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/newkirk/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/futures-macro-0.3.32/src/join.rs`."><title>join.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="futures_macro" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="../../static.files/src-script-813739b1.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[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="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">futures_macro/</div>join.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-3"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="doccomment">//! The futures-rs `join!` macro implementation.
<a href=#2 id=2 data-nosnippet>2</a>
<a href=#3 id=3 data-nosnippet>3</a></span><span class="kw">use </span>proc_macro::TokenStream;
<a href=#4 id=4 data-nosnippet>4</a><span class="kw">use </span>proc_macro2::{Span, TokenStream <span class="kw">as </span>TokenStream2};
<a href=#5 id=5 data-nosnippet>5</a><span class="kw">use </span>quote::{format_ident, quote};
<a href=#6 id=6 data-nosnippet>6</a><span class="kw">use </span>syn::parse::{Parse, ParseStream};
<a href=#7 id=7 data-nosnippet>7</a><span class="kw">use </span>syn::{Expr, Ident, Token};
<a href=#8 id=8 data-nosnippet>8</a>
<a href=#9 id=9 data-nosnippet>9</a><span class="attr">#[derive(Default)]
<a href=#10 id=10 data-nosnippet>10</a></span><span class="kw">struct </span>Join {
<a href=#11 id=11 data-nosnippet>11</a> fut_exprs: Vec&lt;Expr&gt;,
<a href=#12 id=12 data-nosnippet>12</a>}
<a href=#13 id=13 data-nosnippet>13</a>
<a href=#14 id=14 data-nosnippet>14</a><span class="kw">impl </span>Parse <span class="kw">for </span>Join {
<a href=#15 id=15 data-nosnippet>15</a> <span class="kw">fn </span>parse(input: ParseStream&lt;<span class="lifetime">'_</span>&gt;) -&gt; syn::Result&lt;<span class="self">Self</span>&gt; {
<a href=#16 id=16 data-nosnippet>16</a> <span class="kw">let </span><span class="kw-2">mut </span>join = <span class="self">Self</span>::default();
<a href=#17 id=17 data-nosnippet>17</a>
<a href=#18 id=18 data-nosnippet>18</a> <span class="kw">while </span>!input.is_empty() {
<a href=#19 id=19 data-nosnippet>19</a> join.fut_exprs.push(input.parse::&lt;Expr&gt;()<span class="question-mark">?</span>);
<a href=#20 id=20 data-nosnippet>20</a>
<a href=#21 id=21 data-nosnippet>21</a> <span class="kw">if </span>!input.is_empty() {
<a href=#22 id=22 data-nosnippet>22</a> input.parse::&lt;<span class="macro">Token!</span>[,]&gt;()<span class="question-mark">?</span>;
<a href=#23 id=23 data-nosnippet>23</a> }
<a href=#24 id=24 data-nosnippet>24</a> }
<a href=#25 id=25 data-nosnippet>25</a>
<a href=#26 id=26 data-nosnippet>26</a> <span class="prelude-val">Ok</span>(join)
<a href=#27 id=27 data-nosnippet>27</a> }
<a href=#28 id=28 data-nosnippet>28</a>}
<a href=#29 id=29 data-nosnippet>29</a>
<a href=#30 id=30 data-nosnippet>30</a><span class="kw">fn </span>bind_futures(fut_exprs: Vec&lt;Expr&gt;, span: Span) -&gt; (Vec&lt;TokenStream2&gt;, Vec&lt;Ident&gt;) {
<a href=#31 id=31 data-nosnippet>31</a> <span class="kw">let </span><span class="kw-2">mut </span>future_let_bindings = Vec::with_capacity(fut_exprs.len());
<a href=#32 id=32 data-nosnippet>32</a> <span class="kw">let </span>future_names: Vec&lt;<span class="kw">_</span>&gt; = fut_exprs
<a href=#33 id=33 data-nosnippet>33</a> .into_iter()
<a href=#34 id=34 data-nosnippet>34</a> .enumerate()
<a href=#35 id=35 data-nosnippet>35</a> .map(|(i, expr)| {
<a href=#36 id=36 data-nosnippet>36</a> <span class="kw">let </span>name = <span class="macro">format_ident!</span>(<span class="string">"_fut{}"</span>, i, span = span);
<a href=#37 id=37 data-nosnippet>37</a> future_let_bindings.push(<span class="macro">quote!</span> {
<a href=#38 id=38 data-nosnippet>38</a> <span class="comment">// Move future into a local so that it is pinned in one place and
<a href=#39 id=39 data-nosnippet>39</a> // is no longer accessible by the end user.
<a href=#40 id=40 data-nosnippet>40</a> </span><span class="kw">let </span><span class="kw-2">mut </span>#name = __futures_crate::future::maybe_done(#expr);
<a href=#41 id=41 data-nosnippet>41</a> <span class="kw">let </span><span class="kw-2">mut </span>#name = <span class="kw">unsafe </span>{ __futures_crate::Pin::new_unchecked(<span class="kw-2">&amp;mut </span>#name) };
<a href=#42 id=42 data-nosnippet>42</a> });
<a href=#43 id=43 data-nosnippet>43</a> name
<a href=#44 id=44 data-nosnippet>44</a> })
<a href=#45 id=45 data-nosnippet>45</a> .collect();
<a href=#46 id=46 data-nosnippet>46</a>
<a href=#47 id=47 data-nosnippet>47</a> (future_let_bindings, future_names)
<a href=#48 id=48 data-nosnippet>48</a>}
<a href=#49 id=49 data-nosnippet>49</a>
<a href=#50 id=50 data-nosnippet>50</a><span class="doccomment">/// The `join!` macro.
<a href=#51 id=51 data-nosnippet>51</a></span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>join(input: TokenStream) -&gt; TokenStream {
<a href=#52 id=52 data-nosnippet>52</a> <span class="kw">let </span>parsed = <span class="macro">syn::parse_macro_input!</span>(input <span class="kw">as </span>Join);
<a href=#53 id=53 data-nosnippet>53</a>
<a href=#54 id=54 data-nosnippet>54</a> <span class="comment">// should be def_site, but that's unstable
<a href=#55 id=55 data-nosnippet>55</a> </span><span class="kw">let </span>span = Span::call_site();
<a href=#56 id=56 data-nosnippet>56</a>
<a href=#57 id=57 data-nosnippet>57</a> <span class="kw">let </span>(future_let_bindings, future_names) = bind_futures(parsed.fut_exprs, span);
<a href=#58 id=58 data-nosnippet>58</a>
<a href=#59 id=59 data-nosnippet>59</a> <span class="kw">let </span>poll_futures = future_names.iter().map(|fut| {
<a href=#60 id=60 data-nosnippet>60</a> <span class="macro">quote!</span> {
<a href=#61 id=61 data-nosnippet>61</a> __all_done &amp;= __futures_crate::future::Future::poll(
<a href=#62 id=62 data-nosnippet>62</a> #fut.as_mut(), __cx).is_ready();
<a href=#63 id=63 data-nosnippet>63</a> }
<a href=#64 id=64 data-nosnippet>64</a> });
<a href=#65 id=65 data-nosnippet>65</a> <span class="kw">let </span>take_outputs = future_names.iter().map(|fut| {
<a href=#66 id=66 data-nosnippet>66</a> <span class="macro">quote!</span> {
<a href=#67 id=67 data-nosnippet>67</a> #fut.as_mut().take_output().unwrap(),
<a href=#68 id=68 data-nosnippet>68</a> }
<a href=#69 id=69 data-nosnippet>69</a> });
<a href=#70 id=70 data-nosnippet>70</a>
<a href=#71 id=71 data-nosnippet>71</a> TokenStream::from(<span class="macro">quote!</span> { {
<a href=#72 id=72 data-nosnippet>72</a> #( #future_let_bindings )*
<a href=#73 id=73 data-nosnippet>73</a>
<a href=#74 id=74 data-nosnippet>74</a> __futures_crate::future::poll_fn(<span class="kw">move </span>|__cx: <span class="kw-2">&amp;mut </span>__futures_crate::task::Context&lt;<span class="lifetime">'_</span>&gt;| {
<a href=#75 id=75 data-nosnippet>75</a> <span class="kw">let </span><span class="kw-2">mut </span>__all_done = <span class="bool-val">true</span>;
<a href=#76 id=76 data-nosnippet>76</a> #( #poll_futures )*
<a href=#77 id=77 data-nosnippet>77</a> <span class="kw">if </span>__all_done {
<a href=#78 id=78 data-nosnippet>78</a> __futures_crate::task::Poll::Ready((
<a href=#79 id=79 data-nosnippet>79</a> #( #take_outputs )*
<a href=#80 id=80 data-nosnippet>80</a> ))
<a href=#81 id=81 data-nosnippet>81</a> } <span class="kw">else </span>{
<a href=#82 id=82 data-nosnippet>82</a> __futures_crate::task::Poll::Pending
<a href=#83 id=83 data-nosnippet>83</a> }
<a href=#84 id=84 data-nosnippet>84</a> }).<span class="kw">await
<a href=#85 id=85 data-nosnippet>85</a> </span>} })
<a href=#86 id=86 data-nosnippet>86</a>}
<a href=#87 id=87 data-nosnippet>87</a>
<a href=#88 id=88 data-nosnippet>88</a><span class="doccomment">/// The `try_join!` macro.
<a href=#89 id=89 data-nosnippet>89</a></span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>try_join(input: TokenStream) -&gt; TokenStream {
<a href=#90 id=90 data-nosnippet>90</a> <span class="kw">let </span>parsed = <span class="macro">syn::parse_macro_input!</span>(input <span class="kw">as </span>Join);
<a href=#91 id=91 data-nosnippet>91</a>
<a href=#92 id=92 data-nosnippet>92</a> <span class="comment">// should be def_site, but that's unstable
<a href=#93 id=93 data-nosnippet>93</a> </span><span class="kw">let </span>span = Span::call_site();
<a href=#94 id=94 data-nosnippet>94</a>
<a href=#95 id=95 data-nosnippet>95</a> <span class="kw">let </span>(future_let_bindings, future_names) = bind_futures(parsed.fut_exprs, span);
<a href=#96 id=96 data-nosnippet>96</a>
<a href=#97 id=97 data-nosnippet>97</a> <span class="kw">let </span>poll_futures = future_names.iter().map(|fut| {
<a href=#98 id=98 data-nosnippet>98</a> <span class="macro">quote!</span> {
<a href=#99 id=99 data-nosnippet>99</a> <span class="kw">if </span>__futures_crate::future::Future::poll(
<a href=#100 id=100 data-nosnippet>100</a> #fut.as_mut(), __cx).is_pending()
<a href=#101 id=101 data-nosnippet>101</a> {
<a href=#102 id=102 data-nosnippet>102</a> __all_done = <span class="bool-val">false</span>;
<a href=#103 id=103 data-nosnippet>103</a> } <span class="kw">else if </span>#fut.as_mut().output_mut().unwrap().is_err() {
<a href=#104 id=104 data-nosnippet>104</a> <span class="comment">// `.err().unwrap()` rather than `.unwrap_err()` so that we don't introduce
<a href=#105 id=105 data-nosnippet>105</a> // a `T: Debug` bound.
<a href=#106 id=106 data-nosnippet>106</a> // Also, for an error type of ! any code after `err().unwrap()` is unreachable.
<a href=#107 id=107 data-nosnippet>107</a> </span><span class="attr">#[allow(unreachable_code)]
<a href=#108 id=108 data-nosnippet>108</a> </span><span class="kw">return </span>__futures_crate::task::Poll::Ready(
<a href=#109 id=109 data-nosnippet>109</a> __futures_crate::Err(
<a href=#110 id=110 data-nosnippet>110</a> #fut.as_mut().take_output().unwrap().err().unwrap()
<a href=#111 id=111 data-nosnippet>111</a> )
<a href=#112 id=112 data-nosnippet>112</a> );
<a href=#113 id=113 data-nosnippet>113</a> }
<a href=#114 id=114 data-nosnippet>114</a> }
<a href=#115 id=115 data-nosnippet>115</a> });
<a href=#116 id=116 data-nosnippet>116</a> <span class="kw">let </span>take_outputs = future_names.iter().map(|fut| {
<a href=#117 id=117 data-nosnippet>117</a> <span class="macro">quote!</span> {
<a href=#118 id=118 data-nosnippet>118</a> <span class="comment">// `.ok().unwrap()` rather than `.unwrap()` so that we don't introduce
<a href=#119 id=119 data-nosnippet>119</a> // an `E: Debug` bound.
<a href=#120 id=120 data-nosnippet>120</a> // Also, for an ok type of ! any code after `ok().unwrap()` is unreachable.
<a href=#121 id=121 data-nosnippet>121</a> </span><span class="attr">#[allow(unreachable_code)]
<a href=#122 id=122 data-nosnippet>122</a> </span>#fut.as_mut().take_output().unwrap().ok().unwrap(),
<a href=#123 id=123 data-nosnippet>123</a> }
<a href=#124 id=124 data-nosnippet>124</a> });
<a href=#125 id=125 data-nosnippet>125</a>
<a href=#126 id=126 data-nosnippet>126</a> TokenStream::from(<span class="macro">quote!</span> { {
<a href=#127 id=127 data-nosnippet>127</a> #( #future_let_bindings )*
<a href=#128 id=128 data-nosnippet>128</a>
<a href=#129 id=129 data-nosnippet>129</a> <span class="attr">#[allow(clippy::diverging_sub_expression)]
<a href=#130 id=130 data-nosnippet>130</a> </span>__futures_crate::future::poll_fn(<span class="kw">move </span>|__cx: <span class="kw-2">&amp;mut </span>__futures_crate::task::Context&lt;<span class="lifetime">'_</span>&gt;| {
<a href=#131 id=131 data-nosnippet>131</a> <span class="kw">let </span><span class="kw-2">mut </span>__all_done = <span class="bool-val">true</span>;
<a href=#132 id=132 data-nosnippet>132</a> #( #poll_futures )*
<a href=#133 id=133 data-nosnippet>133</a> <span class="kw">if </span>__all_done {
<a href=#134 id=134 data-nosnippet>134</a> __futures_crate::task::Poll::Ready(
<a href=#135 id=135 data-nosnippet>135</a> __futures_crate::Ok((
<a href=#136 id=136 data-nosnippet>136</a> #( #take_outputs )*
<a href=#137 id=137 data-nosnippet>137</a> ))
<a href=#138 id=138 data-nosnippet>138</a> )
<a href=#139 id=139 data-nosnippet>139</a> } <span class="kw">else </span>{
<a href=#140 id=140 data-nosnippet>140</a> __futures_crate::task::Poll::Pending
<a href=#141 id=141 data-nosnippet>141</a> }
<a href=#142 id=142 data-nosnippet>142</a> }).<span class="kw">await
<a href=#143 id=143 data-nosnippet>143</a> </span>} })
<a href=#144 id=144 data-nosnippet>144</a>}
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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/newkirk/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/futures-macro-0.3.32/src/lib.rs`."><title>lib.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="futures_macro" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="../../static.files/src-script-813739b1.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[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="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">futures_macro/</div>lib.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-2"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="doccomment">//! The futures-rs procedural macro implementations.
<a href=#2 id=2 data-nosnippet>2</a>
<a href=#3 id=3 data-nosnippet>3</a></span><span class="attr">#![doc(test(
<a href=#4 id=4 data-nosnippet>4</a> no_crate_inject,
<a href=#5 id=5 data-nosnippet>5</a> attr(
<a href=#6 id=6 data-nosnippet>6</a> deny(warnings, rust_2018_idioms, single_use_lifetimes),
<a href=#7 id=7 data-nosnippet>7</a> allow(dead_code, unused_assignments, unused_variables)
<a href=#8 id=8 data-nosnippet>8</a> )
<a href=#9 id=9 data-nosnippet>9</a>))]
<a href=#10 id=10 data-nosnippet>10</a>
<a href=#11 id=11 data-nosnippet>11</a></span><span class="kw">use </span>proc_macro::TokenStream;
<a href=#12 id=12 data-nosnippet>12</a>
<a href=#13 id=13 data-nosnippet>13</a><span class="kw">mod </span>executor;
<a href=#14 id=14 data-nosnippet>14</a><span class="kw">mod </span>join;
<a href=#15 id=15 data-nosnippet>15</a><span class="kw">mod </span>select;
<a href=#16 id=16 data-nosnippet>16</a><span class="kw">mod </span>stream_select;
<a href=#17 id=17 data-nosnippet>17</a>
<a href=#18 id=18 data-nosnippet>18</a><span class="doccomment">/// The `join!` macro.
<a href=#19 id=19 data-nosnippet>19</a></span><span class="attr">#[proc_macro]
<a href=#20 id=20 data-nosnippet>20</a></span><span class="kw">pub fn </span>join_internal(input: TokenStream) -&gt; TokenStream {
<a href=#21 id=21 data-nosnippet>21</a> <span class="kw">crate</span>::join::join(input)
<a href=#22 id=22 data-nosnippet>22</a>}
<a href=#23 id=23 data-nosnippet>23</a>
<a href=#24 id=24 data-nosnippet>24</a><span class="doccomment">/// The `try_join!` macro.
<a href=#25 id=25 data-nosnippet>25</a></span><span class="attr">#[proc_macro]
<a href=#26 id=26 data-nosnippet>26</a></span><span class="kw">pub fn </span>try_join_internal(input: TokenStream) -&gt; TokenStream {
<a href=#27 id=27 data-nosnippet>27</a> <span class="kw">crate</span>::join::try_join(input)
<a href=#28 id=28 data-nosnippet>28</a>}
<a href=#29 id=29 data-nosnippet>29</a>
<a href=#30 id=30 data-nosnippet>30</a><span class="doccomment">/// The `select!` macro.
<a href=#31 id=31 data-nosnippet>31</a></span><span class="attr">#[proc_macro]
<a href=#32 id=32 data-nosnippet>32</a></span><span class="kw">pub fn </span>select_internal(input: TokenStream) -&gt; TokenStream {
<a href=#33 id=33 data-nosnippet>33</a> <span class="kw">crate</span>::select::select(input)
<a href=#34 id=34 data-nosnippet>34</a>}
<a href=#35 id=35 data-nosnippet>35</a>
<a href=#36 id=36 data-nosnippet>36</a><span class="doccomment">/// The `select_biased!` macro.
<a href=#37 id=37 data-nosnippet>37</a></span><span class="attr">#[proc_macro]
<a href=#38 id=38 data-nosnippet>38</a></span><span class="kw">pub fn </span>select_biased_internal(input: TokenStream) -&gt; TokenStream {
<a href=#39 id=39 data-nosnippet>39</a> <span class="kw">crate</span>::select::select_biased(input)
<a href=#40 id=40 data-nosnippet>40</a>}
<a href=#41 id=41 data-nosnippet>41</a>
<a href=#42 id=42 data-nosnippet>42</a><span class="comment">// TODO: Change this to doc comment once rustdoc bug fixed: https://github.com/rust-lang/futures-rs/pull/2435
<a href=#43 id=43 data-nosnippet>43</a>// The `test` attribute.
<a href=#44 id=44 data-nosnippet>44</a></span><span class="attr">#[proc_macro_attribute]
<a href=#45 id=45 data-nosnippet>45</a></span><span class="kw">pub fn </span>test_internal(input: TokenStream, item: TokenStream) -&gt; TokenStream {
<a href=#46 id=46 data-nosnippet>46</a> <span class="kw">crate</span>::executor::test(input, item)
<a href=#47 id=47 data-nosnippet>47</a>}
<a href=#48 id=48 data-nosnippet>48</a>
<a href=#49 id=49 data-nosnippet>49</a><span class="doccomment">/// The `stream_select!` macro.
<a href=#50 id=50 data-nosnippet>50</a></span><span class="attr">#[proc_macro]
<a href=#51 id=51 data-nosnippet>51</a></span><span class="kw">pub fn </span>stream_select_internal(input: TokenStream) -&gt; TokenStream {
<a href=#52 id=52 data-nosnippet>52</a> <span class="kw">crate</span>::stream_select::stream_select(input.into())
<a href=#53 id=53 data-nosnippet>53</a> .unwrap_or_else(syn::Error::into_compile_error)
<a href=#54 id=54 data-nosnippet>54</a> .into()
<a href=#55 id=55 data-nosnippet>55</a>}
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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/newkirk/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/futures-macro-0.3.32/src/select.rs`."><title>select.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="futures_macro" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="../../static.files/src-script-813739b1.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[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="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">futures_macro/</div>select.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-3"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="doccomment">//! The futures-rs `select!` macro implementation.
<a href=#2 id=2 data-nosnippet>2</a>
<a href=#3 id=3 data-nosnippet>3</a></span><span class="kw">use </span>proc_macro::TokenStream;
<a href=#4 id=4 data-nosnippet>4</a><span class="kw">use </span>proc_macro2::Span;
<a href=#5 id=5 data-nosnippet>5</a><span class="kw">use </span>quote::{format_ident, quote};
<a href=#6 id=6 data-nosnippet>6</a><span class="kw">use </span>syn::parse::{Parse, ParseStream};
<a href=#7 id=7 data-nosnippet>7</a><span class="kw">use </span>syn::{parse_quote, Expr, Ident, Pat, Token};
<a href=#8 id=8 data-nosnippet>8</a>
<a href=#9 id=9 data-nosnippet>9</a><span class="kw">mod </span>kw {
<a href=#10 id=10 data-nosnippet>10</a> <span class="macro">syn::custom_keyword!</span>(complete);
<a href=#11 id=11 data-nosnippet>11</a>}
<a href=#12 id=12 data-nosnippet>12</a>
<a href=#13 id=13 data-nosnippet>13</a><span class="kw">struct </span>Select {
<a href=#14 id=14 data-nosnippet>14</a> <span class="comment">// span of `complete`, then expression after `=&gt; ...`
<a href=#15 id=15 data-nosnippet>15</a> </span>complete: <span class="prelude-ty">Option</span>&lt;Expr&gt;,
<a href=#16 id=16 data-nosnippet>16</a> default: <span class="prelude-ty">Option</span>&lt;Expr&gt;,
<a href=#17 id=17 data-nosnippet>17</a> normal_fut_exprs: Vec&lt;Expr&gt;,
<a href=#18 id=18 data-nosnippet>18</a> normal_fut_handlers: Vec&lt;(Pat, Expr)&gt;,
<a href=#19 id=19 data-nosnippet>19</a>}
<a href=#20 id=20 data-nosnippet>20</a>
<a href=#21 id=21 data-nosnippet>21</a><span class="attr">#[allow(clippy::large_enum_variant)]
<a href=#22 id=22 data-nosnippet>22</a></span><span class="kw">enum </span>CaseKind {
<a href=#23 id=23 data-nosnippet>23</a> Complete,
<a href=#24 id=24 data-nosnippet>24</a> Default,
<a href=#25 id=25 data-nosnippet>25</a> Normal(Pat, Expr),
<a href=#26 id=26 data-nosnippet>26</a>}
<a href=#27 id=27 data-nosnippet>27</a>
<a href=#28 id=28 data-nosnippet>28</a><span class="kw">impl </span>Parse <span class="kw">for </span>Select {
<a href=#29 id=29 data-nosnippet>29</a> <span class="kw">fn </span>parse(input: ParseStream&lt;<span class="lifetime">'_</span>&gt;) -&gt; syn::Result&lt;<span class="self">Self</span>&gt; {
<a href=#30 id=30 data-nosnippet>30</a> <span class="kw">let </span><span class="kw-2">mut </span>select = <span class="self">Self </span>{
<a href=#31 id=31 data-nosnippet>31</a> complete: <span class="prelude-val">None</span>,
<a href=#32 id=32 data-nosnippet>32</a> default: <span class="prelude-val">None</span>,
<a href=#33 id=33 data-nosnippet>33</a> normal_fut_exprs: <span class="macro">vec!</span>[],
<a href=#34 id=34 data-nosnippet>34</a> normal_fut_handlers: <span class="macro">vec!</span>[],
<a href=#35 id=35 data-nosnippet>35</a> };
<a href=#36 id=36 data-nosnippet>36</a>
<a href=#37 id=37 data-nosnippet>37</a> <span class="kw">while </span>!input.is_empty() {
<a href=#38 id=38 data-nosnippet>38</a> <span class="kw">let </span>case_kind = <span class="kw">if </span>input.peek(kw::complete) {
<a href=#39 id=39 data-nosnippet>39</a> <span class="comment">// `complete`
<a href=#40 id=40 data-nosnippet>40</a> </span><span class="kw">if </span>select.complete.is_some() {
<a href=#41 id=41 data-nosnippet>41</a> <span class="kw">return </span><span class="prelude-val">Err</span>(input.error(<span class="string">"multiple `complete` cases found, only one allowed"</span>));
<a href=#42 id=42 data-nosnippet>42</a> }
<a href=#43 id=43 data-nosnippet>43</a> input.parse::&lt;kw::complete&gt;()<span class="question-mark">?</span>;
<a href=#44 id=44 data-nosnippet>44</a> CaseKind::Complete
<a href=#45 id=45 data-nosnippet>45</a> } <span class="kw">else if </span>input.peek(<span class="macro">Token!</span>[default]) {
<a href=#46 id=46 data-nosnippet>46</a> <span class="comment">// `default`
<a href=#47 id=47 data-nosnippet>47</a> </span><span class="kw">if </span>select.default.is_some() {
<a href=#48 id=48 data-nosnippet>48</a> <span class="kw">return </span><span class="prelude-val">Err</span>(input.error(<span class="string">"multiple `default` cases found, only one allowed"</span>));
<a href=#49 id=49 data-nosnippet>49</a> }
<a href=#50 id=50 data-nosnippet>50</a> input.parse::&lt;Ident&gt;()<span class="question-mark">?</span>;
<a href=#51 id=51 data-nosnippet>51</a> CaseKind::Default
<a href=#52 id=52 data-nosnippet>52</a> } <span class="kw">else </span>{
<a href=#53 id=53 data-nosnippet>53</a> <span class="comment">// `&lt;pat&gt; = &lt;expr&gt;`
<a href=#54 id=54 data-nosnippet>54</a> </span><span class="kw">let </span>pat = Pat::parse_multi_with_leading_vert(input)<span class="question-mark">?</span>;
<a href=#55 id=55 data-nosnippet>55</a> input.parse::&lt;<span class="macro">Token!</span>[=]&gt;()<span class="question-mark">?</span>;
<a href=#56 id=56 data-nosnippet>56</a> <span class="kw">let </span>expr = input.parse()<span class="question-mark">?</span>;
<a href=#57 id=57 data-nosnippet>57</a> CaseKind::Normal(pat, expr)
<a href=#58 id=58 data-nosnippet>58</a> };
<a href=#59 id=59 data-nosnippet>59</a>
<a href=#60 id=60 data-nosnippet>60</a> <span class="comment">// `=&gt; &lt;expr&gt;`
<a href=#61 id=61 data-nosnippet>61</a> </span>input.parse::&lt;<span class="macro">Token!</span>[=&gt;]&gt;()<span class="question-mark">?</span>;
<a href=#62 id=62 data-nosnippet>62</a> <span class="kw">let </span>expr = Expr::parse_with_earlier_boundary_rule(input)<span class="question-mark">?</span>;
<a href=#63 id=63 data-nosnippet>63</a>
<a href=#64 id=64 data-nosnippet>64</a> <span class="comment">// Commas after the expression are only optional if it's a `Block`
<a href=#65 id=65 data-nosnippet>65</a> // or it is the last branch in the `match`.
<a href=#66 id=66 data-nosnippet>66</a> </span><span class="kw">let </span>is_block = <span class="kw">match </span>expr {
<a href=#67 id=67 data-nosnippet>67</a> Expr::Block(<span class="kw">_</span>) =&gt; <span class="bool-val">true</span>,
<a href=#68 id=68 data-nosnippet>68</a> <span class="kw">_ </span>=&gt; <span class="bool-val">false</span>,
<a href=#69 id=69 data-nosnippet>69</a> };
<a href=#70 id=70 data-nosnippet>70</a> <span class="kw">if </span>is_block || input.is_empty() {
<a href=#71 id=71 data-nosnippet>71</a> input.parse::&lt;<span class="prelude-ty">Option</span>&lt;<span class="macro">Token!</span>[,]&gt;&gt;()<span class="question-mark">?</span>;
<a href=#72 id=72 data-nosnippet>72</a> } <span class="kw">else </span>{
<a href=#73 id=73 data-nosnippet>73</a> input.parse::&lt;<span class="macro">Token!</span>[,]&gt;()<span class="question-mark">?</span>;
<a href=#74 id=74 data-nosnippet>74</a> }
<a href=#75 id=75 data-nosnippet>75</a>
<a href=#76 id=76 data-nosnippet>76</a> <span class="kw">match </span>case_kind {
<a href=#77 id=77 data-nosnippet>77</a> CaseKind::Complete =&gt; select.complete = <span class="prelude-val">Some</span>(expr),
<a href=#78 id=78 data-nosnippet>78</a> CaseKind::Default =&gt; select.default = <span class="prelude-val">Some</span>(expr),
<a href=#79 id=79 data-nosnippet>79</a> CaseKind::Normal(pat, fut_expr) =&gt; {
<a href=#80 id=80 data-nosnippet>80</a> select.normal_fut_exprs.push(fut_expr);
<a href=#81 id=81 data-nosnippet>81</a> select.normal_fut_handlers.push((pat, expr));
<a href=#82 id=82 data-nosnippet>82</a> }
<a href=#83 id=83 data-nosnippet>83</a> }
<a href=#84 id=84 data-nosnippet>84</a> }
<a href=#85 id=85 data-nosnippet>85</a>
<a href=#86 id=86 data-nosnippet>86</a> <span class="prelude-val">Ok</span>(select)
<a href=#87 id=87 data-nosnippet>87</a> }
<a href=#88 id=88 data-nosnippet>88</a>}
<a href=#89 id=89 data-nosnippet>89</a>
<a href=#90 id=90 data-nosnippet>90</a><span class="comment">// Enum over all the cases in which the `select!` waiting has completed and the result
<a href=#91 id=91 data-nosnippet>91</a>// can be processed.
<a href=#92 id=92 data-nosnippet>92</a>//
<a href=#93 id=93 data-nosnippet>93</a>// `enum __PrivResult&lt;_1, _2, ...&gt; { _1(_1), _2(_2), ..., Complete }`
<a href=#94 id=94 data-nosnippet>94</a></span><span class="kw">fn </span>declare_result_enum(
<a href=#95 id=95 data-nosnippet>95</a> result_ident: Ident,
<a href=#96 id=96 data-nosnippet>96</a> variants: usize,
<a href=#97 id=97 data-nosnippet>97</a> complete: bool,
<a href=#98 id=98 data-nosnippet>98</a> span: Span,
<a href=#99 id=99 data-nosnippet>99</a>) -&gt; (Vec&lt;Ident&gt;, syn::ItemEnum) {
<a href=#100 id=100 data-nosnippet>100</a> <span class="comment">// "_0", "_1", "_2"
<a href=#101 id=101 data-nosnippet>101</a> </span><span class="kw">let </span>variant_names: Vec&lt;Ident&gt; =
<a href=#102 id=102 data-nosnippet>102</a> (<span class="number">0</span>..variants).map(|num| <span class="macro">format_ident!</span>(<span class="string">"_{}"</span>, num, span = span)).collect();
<a href=#103 id=103 data-nosnippet>103</a>
<a href=#104 id=104 data-nosnippet>104</a> <span class="kw">let </span>type_parameters = <span class="kw-2">&amp;</span>variant_names;
<a href=#105 id=105 data-nosnippet>105</a> <span class="kw">let </span>variants = <span class="kw-2">&amp;</span>variant_names;
<a href=#106 id=106 data-nosnippet>106</a>
<a href=#107 id=107 data-nosnippet>107</a> <span class="kw">let </span>complete_variant = <span class="kw">if </span>complete { <span class="prelude-val">Some</span>(<span class="macro">quote!</span>(Complete)) } <span class="kw">else </span>{ <span class="prelude-val">None </span>};
<a href=#108 id=108 data-nosnippet>108</a>
<a href=#109 id=109 data-nosnippet>109</a> <span class="kw">let </span>enum_item = <span class="macro">parse_quote!</span> {
<a href=#110 id=110 data-nosnippet>110</a> <span class="kw">enum </span>#result_ident&lt;#(#type_parameters,)<span class="kw-2">*</span>&gt; {
<a href=#111 id=111 data-nosnippet>111</a> #(
<a href=#112 id=112 data-nosnippet>112</a> #variants(#type_parameters),
<a href=#113 id=113 data-nosnippet>113</a> )*
<a href=#114 id=114 data-nosnippet>114</a> #complete_variant
<a href=#115 id=115 data-nosnippet>115</a> }
<a href=#116 id=116 data-nosnippet>116</a> };
<a href=#117 id=117 data-nosnippet>117</a>
<a href=#118 id=118 data-nosnippet>118</a> (variant_names, enum_item)
<a href=#119 id=119 data-nosnippet>119</a>}
<a href=#120 id=120 data-nosnippet>120</a>
<a href=#121 id=121 data-nosnippet>121</a><span class="doccomment">/// The `select!` macro.
<a href=#122 id=122 data-nosnippet>122</a></span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>select(input: TokenStream) -&gt; TokenStream {
<a href=#123 id=123 data-nosnippet>123</a> select_inner(input, <span class="bool-val">true</span>)
<a href=#124 id=124 data-nosnippet>124</a>}
<a href=#125 id=125 data-nosnippet>125</a>
<a href=#126 id=126 data-nosnippet>126</a><span class="doccomment">/// The `select_biased!` macro.
<a href=#127 id=127 data-nosnippet>127</a></span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>select_biased(input: TokenStream) -&gt; TokenStream {
<a href=#128 id=128 data-nosnippet>128</a> select_inner(input, <span class="bool-val">false</span>)
<a href=#129 id=129 data-nosnippet>129</a>}
<a href=#130 id=130 data-nosnippet>130</a>
<a href=#131 id=131 data-nosnippet>131</a><span class="kw">fn </span>select_inner(input: TokenStream, random: bool) -&gt; TokenStream {
<a href=#132 id=132 data-nosnippet>132</a> <span class="kw">let </span>parsed = <span class="macro">syn::parse_macro_input!</span>(input <span class="kw">as </span>Select);
<a href=#133 id=133 data-nosnippet>133</a>
<a href=#134 id=134 data-nosnippet>134</a> <span class="comment">// should be def_site, but that's unstable
<a href=#135 id=135 data-nosnippet>135</a> </span><span class="kw">let </span>span = Span::call_site();
<a href=#136 id=136 data-nosnippet>136</a>
<a href=#137 id=137 data-nosnippet>137</a> <span class="kw">let </span>enum_ident = Ident::new(<span class="string">"__PrivResult"</span>, span);
<a href=#138 id=138 data-nosnippet>138</a>
<a href=#139 id=139 data-nosnippet>139</a> <span class="kw">let </span>(variant_names, enum_item) = declare_result_enum(
<a href=#140 id=140 data-nosnippet>140</a> enum_ident.clone(),
<a href=#141 id=141 data-nosnippet>141</a> parsed.normal_fut_exprs.len(),
<a href=#142 id=142 data-nosnippet>142</a> parsed.complete.is_some(),
<a href=#143 id=143 data-nosnippet>143</a> span,
<a href=#144 id=144 data-nosnippet>144</a> );
<a href=#145 id=145 data-nosnippet>145</a>
<a href=#146 id=146 data-nosnippet>146</a> <span class="comment">// bind non-`Ident` future exprs w/ `let`
<a href=#147 id=147 data-nosnippet>147</a> </span><span class="kw">let </span><span class="kw-2">mut </span>future_let_bindings = Vec::with_capacity(parsed.normal_fut_exprs.len());
<a href=#148 id=148 data-nosnippet>148</a> <span class="kw">let </span>bound_future_names: Vec&lt;<span class="kw">_</span>&gt; = parsed
<a href=#149 id=149 data-nosnippet>149</a> .normal_fut_exprs
<a href=#150 id=150 data-nosnippet>150</a> .into_iter()
<a href=#151 id=151 data-nosnippet>151</a> .zip(variant_names.iter())
<a href=#152 id=152 data-nosnippet>152</a> .map(|(expr, variant_name)| {
<a href=#153 id=153 data-nosnippet>153</a> <span class="kw">match </span>expr {
<a href=#154 id=154 data-nosnippet>154</a> syn::Expr::Path(path) =&gt; {
<a href=#155 id=155 data-nosnippet>155</a> <span class="comment">// Don't bind futures that are already a path.
<a href=#156 id=156 data-nosnippet>156</a> // This prevents creating redundant stack space
<a href=#157 id=157 data-nosnippet>157</a> // for them.
<a href=#158 id=158 data-nosnippet>158</a> // Passing Futures by path requires those Futures to implement Unpin.
<a href=#159 id=159 data-nosnippet>159</a> // We check for this condition here in order to be able to
<a href=#160 id=160 data-nosnippet>160</a> // safely use Pin::new_unchecked(&amp;mut #path) later on.
<a href=#161 id=161 data-nosnippet>161</a> </span>future_let_bindings.push(<span class="macro">quote!</span> {
<a href=#162 id=162 data-nosnippet>162</a> __futures_crate::async_await::assert_fused_future(<span class="kw-2">&amp;</span>#path);
<a href=#163 id=163 data-nosnippet>163</a> __futures_crate::async_await::assert_unpin(<span class="kw-2">&amp;</span>#path);
<a href=#164 id=164 data-nosnippet>164</a> });
<a href=#165 id=165 data-nosnippet>165</a> path
<a href=#166 id=166 data-nosnippet>166</a> }
<a href=#167 id=167 data-nosnippet>167</a> <span class="kw">_ </span>=&gt; {
<a href=#168 id=168 data-nosnippet>168</a> <span class="comment">// Bind and pin the resulting Future on the stack. This is
<a href=#169 id=169 data-nosnippet>169</a> // necessary to support direct select! calls on !Unpin
<a href=#170 id=170 data-nosnippet>170</a> // Futures. The Future is not explicitly pinned here with
<a href=#171 id=171 data-nosnippet>171</a> // a Pin call, but assumed as pinned. The actual Pin is
<a href=#172 id=172 data-nosnippet>172</a> // created inside the poll() function below to defer the
<a href=#173 id=173 data-nosnippet>173</a> // creation of the temporary pointer, which would otherwise
<a href=#174 id=174 data-nosnippet>174</a> // increase the size of the generated Future.
<a href=#175 id=175 data-nosnippet>175</a> // Safety: This is safe since the lifetime of the Future
<a href=#176 id=176 data-nosnippet>176</a> // is totally constraint to the lifetime of the select!
<a href=#177 id=177 data-nosnippet>177</a> // expression, and the Future can't get moved inside it
<a href=#178 id=178 data-nosnippet>178</a> // (it is shadowed).
<a href=#179 id=179 data-nosnippet>179</a> </span>future_let_bindings.push(<span class="macro">quote!</span> {
<a href=#180 id=180 data-nosnippet>180</a> <span class="kw">let </span><span class="kw-2">mut </span>#variant_name = #expr;
<a href=#181 id=181 data-nosnippet>181</a> });
<a href=#182 id=182 data-nosnippet>182</a> <span class="macro">parse_quote!</span> { #variant_name }
<a href=#183 id=183 data-nosnippet>183</a> }
<a href=#184 id=184 data-nosnippet>184</a> }
<a href=#185 id=185 data-nosnippet>185</a> })
<a href=#186 id=186 data-nosnippet>186</a> .collect();
<a href=#187 id=187 data-nosnippet>187</a>
<a href=#188 id=188 data-nosnippet>188</a> <span class="comment">// For each future, make an `&amp;mut dyn FnMut(&amp;mut Context&lt;'_&gt;) -&gt; Option&lt;Poll&lt;__PrivResult&lt;...&gt;&gt;`
<a href=#189 id=189 data-nosnippet>189</a> // to use for polling that individual future. These will then be put in an array.
<a href=#190 id=190 data-nosnippet>190</a> </span><span class="kw">let </span>poll_functions = bound_future_names.iter().zip(variant_names.iter()).map(
<a href=#191 id=191 data-nosnippet>191</a> |(bound_future_name, variant_name)| {
<a href=#192 id=192 data-nosnippet>192</a> <span class="comment">// Below we lazily create the Pin on the Future below.
<a href=#193 id=193 data-nosnippet>193</a> // This is done in order to avoid allocating memory in the generator
<a href=#194 id=194 data-nosnippet>194</a> // for the Pin variable.
<a href=#195 id=195 data-nosnippet>195</a> // Safety: This is safe because one of the following condition applies:
<a href=#196 id=196 data-nosnippet>196</a> // 1. The Future is passed by the caller by name, and we assert that
<a href=#197 id=197 data-nosnippet>197</a> // it implements Unpin.
<a href=#198 id=198 data-nosnippet>198</a> // 2. The Future is created in scope of the select! function and will
<a href=#199 id=199 data-nosnippet>199</a> // not be moved for the duration of it. It is thereby stack-pinned
<a href=#200 id=200 data-nosnippet>200</a> </span><span class="macro">quote!</span> {
<a href=#201 id=201 data-nosnippet>201</a> <span class="kw">let </span><span class="kw-2">mut </span>#variant_name = |__cx: <span class="kw-2">&amp;mut </span>__futures_crate::task::Context&lt;<span class="lifetime">'_</span>&gt;| {
<a href=#202 id=202 data-nosnippet>202</a> <span class="kw">let </span><span class="kw-2">mut </span>#bound_future_name = <span class="kw">unsafe </span>{
<a href=#203 id=203 data-nosnippet>203</a> __futures_crate::Pin::new_unchecked(<span class="kw-2">&amp;mut </span>#bound_future_name)
<a href=#204 id=204 data-nosnippet>204</a> };
<a href=#205 id=205 data-nosnippet>205</a> <span class="kw">if </span>__futures_crate::future::FusedFuture::is_terminated(<span class="kw-2">&amp;</span>#bound_future_name) {
<a href=#206 id=206 data-nosnippet>206</a> __futures_crate::None
<a href=#207 id=207 data-nosnippet>207</a> } <span class="kw">else </span>{
<a href=#208 id=208 data-nosnippet>208</a> __futures_crate::Some(__futures_crate::future::FutureExt::poll_unpin(
<a href=#209 id=209 data-nosnippet>209</a> <span class="kw-2">&amp;mut </span>#bound_future_name,
<a href=#210 id=210 data-nosnippet>210</a> __cx,
<a href=#211 id=211 data-nosnippet>211</a> ).map(#enum_ident::#variant_name))
<a href=#212 id=212 data-nosnippet>212</a> }
<a href=#213 id=213 data-nosnippet>213</a> };
<a href=#214 id=214 data-nosnippet>214</a> <span class="kw">let </span>#variant_name: <span class="kw-2">&amp;mut </span><span class="kw">dyn </span>FnMut(
<a href=#215 id=215 data-nosnippet>215</a> <span class="kw-2">&amp;mut </span>__futures_crate::task::Context&lt;<span class="lifetime">'_</span>&gt;
<a href=#216 id=216 data-nosnippet>216</a> ) -&gt; __futures_crate::Option&lt;__futures_crate::task::Poll&lt;<span class="kw">_</span>&gt;&gt; = <span class="kw-2">&amp;mut </span>#variant_name;
<a href=#217 id=217 data-nosnippet>217</a> }
<a href=#218 id=218 data-nosnippet>218</a> },
<a href=#219 id=219 data-nosnippet>219</a> );
<a href=#220 id=220 data-nosnippet>220</a>
<a href=#221 id=221 data-nosnippet>221</a> <span class="kw">let </span>none_polled = <span class="kw">if </span>parsed.complete.is_some() {
<a href=#222 id=222 data-nosnippet>222</a> <span class="macro">quote!</span> {
<a href=#223 id=223 data-nosnippet>223</a> __futures_crate::task::Poll::Ready(#enum_ident::Complete)
<a href=#224 id=224 data-nosnippet>224</a> }
<a href=#225 id=225 data-nosnippet>225</a> } <span class="kw">else </span>{
<a href=#226 id=226 data-nosnippet>226</a> <span class="macro">quote!</span> {
<a href=#227 id=227 data-nosnippet>227</a> <span class="macro">panic!</span>(<span class="string">"all futures in select! were completed, \
<a href=#228 id=228 data-nosnippet>228</a> but no `complete =&gt;` handler was provided"</span>)
<a href=#229 id=229 data-nosnippet>229</a> }
<a href=#230 id=230 data-nosnippet>230</a> };
<a href=#231 id=231 data-nosnippet>231</a>
<a href=#232 id=232 data-nosnippet>232</a> <span class="kw">let </span>branches = parsed.normal_fut_handlers.into_iter().zip(variant_names.iter()).map(
<a href=#233 id=233 data-nosnippet>233</a> |((pat, expr), variant_name)| {
<a href=#234 id=234 data-nosnippet>234</a> <span class="macro">quote!</span> {
<a href=#235 id=235 data-nosnippet>235</a> #enum_ident::#variant_name(#pat) =&gt; #expr,
<a href=#236 id=236 data-nosnippet>236</a> }
<a href=#237 id=237 data-nosnippet>237</a> },
<a href=#238 id=238 data-nosnippet>238</a> );
<a href=#239 id=239 data-nosnippet>239</a> <span class="kw">let </span>branches = <span class="macro">quote!</span> { #( #branches )* };
<a href=#240 id=240 data-nosnippet>240</a>
<a href=#241 id=241 data-nosnippet>241</a> <span class="kw">let </span>complete_branch = parsed.complete.map(|complete_expr| {
<a href=#242 id=242 data-nosnippet>242</a> <span class="macro">quote!</span> {
<a href=#243 id=243 data-nosnippet>243</a> #enum_ident::Complete =&gt; { #complete_expr },
<a href=#244 id=244 data-nosnippet>244</a> }
<a href=#245 id=245 data-nosnippet>245</a> });
<a href=#246 id=246 data-nosnippet>246</a>
<a href=#247 id=247 data-nosnippet>247</a> <span class="kw">let </span>branches = <span class="macro">quote!</span> {
<a href=#248 id=248 data-nosnippet>248</a> #branches
<a href=#249 id=249 data-nosnippet>249</a> #complete_branch
<a href=#250 id=250 data-nosnippet>250</a> };
<a href=#251 id=251 data-nosnippet>251</a>
<a href=#252 id=252 data-nosnippet>252</a> <span class="kw">let </span>await_select_fut = <span class="kw">if </span>parsed.default.is_some() {
<a href=#253 id=253 data-nosnippet>253</a> <span class="comment">// For select! with default this returns the Poll result
<a href=#254 id=254 data-nosnippet>254</a> </span><span class="macro">quote!</span> {
<a href=#255 id=255 data-nosnippet>255</a> __poll_fn(<span class="kw-2">&amp;mut </span>__futures_crate::task::Context::from_waker(
<a href=#256 id=256 data-nosnippet>256</a> __futures_crate::task::noop_waker_ref()
<a href=#257 id=257 data-nosnippet>257</a> ))
<a href=#258 id=258 data-nosnippet>258</a> }
<a href=#259 id=259 data-nosnippet>259</a> } <span class="kw">else </span>{
<a href=#260 id=260 data-nosnippet>260</a> <span class="macro">quote!</span> {
<a href=#261 id=261 data-nosnippet>261</a> __futures_crate::future::poll_fn(__poll_fn).<span class="kw">await
<a href=#262 id=262 data-nosnippet>262</a> </span>}
<a href=#263 id=263 data-nosnippet>263</a> };
<a href=#264 id=264 data-nosnippet>264</a>
<a href=#265 id=265 data-nosnippet>265</a> <span class="kw">let </span>execute_result_expr = <span class="kw">if let </span><span class="prelude-val">Some</span>(default_expr) = <span class="kw-2">&amp;</span>parsed.default {
<a href=#266 id=266 data-nosnippet>266</a> <span class="comment">// For select! with default __select_result is a Poll, otherwise not
<a href=#267 id=267 data-nosnippet>267</a> </span><span class="macro">quote!</span> {
<a href=#268 id=268 data-nosnippet>268</a> <span class="kw">match </span>__select_result {
<a href=#269 id=269 data-nosnippet>269</a> __futures_crate::task::Poll::Ready(result) =&gt; <span class="kw">match </span>result {
<a href=#270 id=270 data-nosnippet>270</a> #branches
<a href=#271 id=271 data-nosnippet>271</a> },
<a href=#272 id=272 data-nosnippet>272</a> <span class="kw">_ </span>=&gt; #default_expr
<a href=#273 id=273 data-nosnippet>273</a> }
<a href=#274 id=274 data-nosnippet>274</a> }
<a href=#275 id=275 data-nosnippet>275</a> } <span class="kw">else </span>{
<a href=#276 id=276 data-nosnippet>276</a> <span class="macro">quote!</span> {
<a href=#277 id=277 data-nosnippet>277</a> <span class="kw">match </span>__select_result {
<a href=#278 id=278 data-nosnippet>278</a> #branches
<a href=#279 id=279 data-nosnippet>279</a> }
<a href=#280 id=280 data-nosnippet>280</a> }
<a href=#281 id=281 data-nosnippet>281</a> };
<a href=#282 id=282 data-nosnippet>282</a>
<a href=#283 id=283 data-nosnippet>283</a> <span class="kw">let </span>shuffle = <span class="kw">if </span>random {
<a href=#284 id=284 data-nosnippet>284</a> <span class="macro">quote!</span> {
<a href=#285 id=285 data-nosnippet>285</a> __futures_crate::async_await::shuffle(<span class="kw-2">&amp;mut </span>__select_arr);
<a href=#286 id=286 data-nosnippet>286</a> }
<a href=#287 id=287 data-nosnippet>287</a> } <span class="kw">else </span>{
<a href=#288 id=288 data-nosnippet>288</a> <span class="macro">quote!</span>()
<a href=#289 id=289 data-nosnippet>289</a> };
<a href=#290 id=290 data-nosnippet>290</a>
<a href=#291 id=291 data-nosnippet>291</a> TokenStream::from(<span class="macro">quote!</span> { {
<a href=#292 id=292 data-nosnippet>292</a> #enum_item
<a href=#293 id=293 data-nosnippet>293</a>
<a href=#294 id=294 data-nosnippet>294</a> <span class="kw">let </span>__select_result = {
<a href=#295 id=295 data-nosnippet>295</a> #( #future_let_bindings )*
<a href=#296 id=296 data-nosnippet>296</a>
<a href=#297 id=297 data-nosnippet>297</a> <span class="kw">let </span><span class="kw-2">mut </span>__poll_fn = |__cx: <span class="kw-2">&amp;mut </span>__futures_crate::task::Context&lt;<span class="lifetime">'_</span>&gt;| {
<a href=#298 id=298 data-nosnippet>298</a> <span class="kw">let </span><span class="kw-2">mut </span>__any_polled = <span class="bool-val">false</span>;
<a href=#299 id=299 data-nosnippet>299</a>
<a href=#300 id=300 data-nosnippet>300</a> #( #poll_functions )*
<a href=#301 id=301 data-nosnippet>301</a>
<a href=#302 id=302 data-nosnippet>302</a> <span class="kw">let </span><span class="kw-2">mut </span>__select_arr = [#( #variant_names ),<span class="kw-2">*</span>];
<a href=#303 id=303 data-nosnippet>303</a> #shuffle
<a href=#304 id=304 data-nosnippet>304</a> <span class="kw">for </span>poller <span class="kw">in </span><span class="kw-2">&amp;mut </span>__select_arr {
<a href=#305 id=305 data-nosnippet>305</a> <span class="kw">let </span>poller: <span class="kw-2">&amp;mut &amp;mut </span><span class="kw">dyn </span>FnMut(
<a href=#306 id=306 data-nosnippet>306</a> <span class="kw-2">&amp;mut </span>__futures_crate::task::Context&lt;<span class="lifetime">'_</span>&gt;
<a href=#307 id=307 data-nosnippet>307</a> ) -&gt; __futures_crate::Option&lt;__futures_crate::task::Poll&lt;<span class="kw">_</span>&gt;&gt; = poller;
<a href=#308 id=308 data-nosnippet>308</a> <span class="kw">match </span>poller(__cx) {
<a href=#309 id=309 data-nosnippet>309</a> __futures_crate::Some(x @ __futures_crate::task::Poll::Ready(<span class="kw">_</span>)) =&gt;
<a href=#310 id=310 data-nosnippet>310</a> <span class="kw">return </span>x,
<a href=#311 id=311 data-nosnippet>311</a> __futures_crate::Some(__futures_crate::task::Poll::Pending) =&gt; {
<a href=#312 id=312 data-nosnippet>312</a> __any_polled = <span class="bool-val">true</span>;
<a href=#313 id=313 data-nosnippet>313</a> }
<a href=#314 id=314 data-nosnippet>314</a> __futures_crate::None =&gt; {}
<a href=#315 id=315 data-nosnippet>315</a> }
<a href=#316 id=316 data-nosnippet>316</a> }
<a href=#317 id=317 data-nosnippet>317</a>
<a href=#318 id=318 data-nosnippet>318</a> <span class="kw">if </span>!__any_polled {
<a href=#319 id=319 data-nosnippet>319</a> #none_polled
<a href=#320 id=320 data-nosnippet>320</a> } <span class="kw">else </span>{
<a href=#321 id=321 data-nosnippet>321</a> __futures_crate::task::Poll::Pending
<a href=#322 id=322 data-nosnippet>322</a> }
<a href=#323 id=323 data-nosnippet>323</a> };
<a href=#324 id=324 data-nosnippet>324</a>
<a href=#325 id=325 data-nosnippet>325</a> #await_select_fut
<a href=#326 id=326 data-nosnippet>326</a> };
<a href=#327 id=327 data-nosnippet>327</a>
<a href=#328 id=328 data-nosnippet>328</a> #execute_result_expr
<a href=#329 id=329 data-nosnippet>329</a> } })
<a href=#330 id=330 data-nosnippet>330</a>}
</code></pre></div></section></main></body></html>

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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/newkirk/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/futures-macro-0.3.32/src/stream_select.rs`."><title>stream_select.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="futures_macro" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="../../static.files/src-script-813739b1.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[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="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">futures_macro/</div>stream_select.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-3"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="kw">use </span>proc_macro2::TokenStream;
<a href=#2 id=2 data-nosnippet>2</a><span class="kw">use </span>quote::{format_ident, quote, ToTokens};
<a href=#3 id=3 data-nosnippet>3</a><span class="kw">use </span>syn::{parse::Parser, punctuated::Punctuated, Expr, Index, Token};
<a href=#4 id=4 data-nosnippet>4</a>
<a href=#5 id=5 data-nosnippet>5</a><span class="doccomment">/// The `stream_select!` macro.
<a href=#6 id=6 data-nosnippet>6</a></span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>stream_select(input: TokenStream) -&gt; <span class="prelude-ty">Result</span>&lt;TokenStream, syn::Error&gt; {
<a href=#7 id=7 data-nosnippet>7</a> <span class="kw">let </span>args = Punctuated::&lt;Expr, <span class="macro">Token!</span>[,]&gt;::parse_terminated.parse2(input)<span class="question-mark">?</span>;
<a href=#8 id=8 data-nosnippet>8</a> <span class="kw">if </span>args.len() &lt; <span class="number">2 </span>{
<a href=#9 id=9 data-nosnippet>9</a> <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="macro">quote!</span> {
<a href=#10 id=10 data-nosnippet>10</a> <span class="macro">compile_error!</span>(<span class="string">"stream select macro needs at least two arguments."</span>)
<a href=#11 id=11 data-nosnippet>11</a> });
<a href=#12 id=12 data-nosnippet>12</a> }
<a href=#13 id=13 data-nosnippet>13</a> <span class="kw">let </span>generic_idents = (<span class="number">0</span>..args.len()).map(|i| <span class="macro">format_ident!</span>(<span class="string">"_{}"</span>, i)).collect::&lt;Vec&lt;<span class="kw">_</span>&gt;&gt;();
<a href=#14 id=14 data-nosnippet>14</a> <span class="kw">let </span>field_idents = (<span class="number">0</span>..args.len()).map(|i| <span class="macro">format_ident!</span>(<span class="string">"__{}"</span>, i)).collect::&lt;Vec&lt;<span class="kw">_</span>&gt;&gt;();
<a href=#15 id=15 data-nosnippet>15</a> <span class="kw">let </span>field_idents_2 = (<span class="number">0</span>..args.len()).map(|i| <span class="macro">format_ident!</span>(<span class="string">"___{}"</span>, i)).collect::&lt;Vec&lt;<span class="kw">_</span>&gt;&gt;();
<a href=#16 id=16 data-nosnippet>16</a> <span class="kw">let </span>field_indices = (<span class="number">0</span>..args.len()).map(Index::from).collect::&lt;Vec&lt;<span class="kw">_</span>&gt;&gt;();
<a href=#17 id=17 data-nosnippet>17</a> <span class="kw">let </span>args = args.iter().map(|e| e.to_token_stream());
<a href=#18 id=18 data-nosnippet>18</a>
<a href=#19 id=19 data-nosnippet>19</a> <span class="prelude-val">Ok</span>(<span class="macro">quote!</span> {
<a href=#20 id=20 data-nosnippet>20</a> {
<a href=#21 id=21 data-nosnippet>21</a> <span class="attr">#[derive(Debug)]
<a href=#22 id=22 data-nosnippet>22</a> </span><span class="kw">struct </span>StreamSelect&lt;#(#generic_idents),<span class="kw-2">*</span>&gt; (#(<span class="prelude-ty">Option</span>&lt;#generic_idents&gt;),<span class="kw-2">*</span>);
<a href=#23 id=23 data-nosnippet>23</a>
<a href=#24 id=24 data-nosnippet>24</a> <span class="kw">enum </span>StreamEnum&lt;#(#generic_idents),<span class="kw-2">*</span>&gt; {
<a href=#25 id=25 data-nosnippet>25</a> #(
<a href=#26 id=26 data-nosnippet>26</a> #generic_idents(#generic_idents)
<a href=#27 id=27 data-nosnippet>27</a> ),<span class="kw-2">*</span>,
<a href=#28 id=28 data-nosnippet>28</a> <span class="prelude-val">None</span>,
<a href=#29 id=29 data-nosnippet>29</a> }
<a href=#30 id=30 data-nosnippet>30</a>
<a href=#31 id=31 data-nosnippet>31</a> <span class="kw">impl</span>&lt;ITEM, #(#generic_idents),<span class="kw-2">*</span>&gt; __futures_crate::stream::Stream <span class="kw">for </span>StreamEnum&lt;#(#generic_idents),<span class="kw-2">*</span>&gt;
<a href=#32 id=32 data-nosnippet>32</a> <span class="kw">where </span>#(#generic_idents: __futures_crate::stream::Stream&lt;Item=ITEM&gt; + ::std::marker::Unpin,)*
<a href=#33 id=33 data-nosnippet>33</a> {
<a href=#34 id=34 data-nosnippet>34</a> <span class="kw">type </span>Item = ITEM;
<a href=#35 id=35 data-nosnippet>35</a>
<a href=#36 id=36 data-nosnippet>36</a> <span class="kw">fn </span>poll_next(<span class="kw-2">mut </span><span class="self">self</span>: ::std::pin::Pin&lt;<span class="kw-2">&amp;mut </span><span class="self">Self</span>&gt;, cx: <span class="kw-2">&amp;mut </span>__futures_crate::task::Context&lt;<span class="lifetime">'_</span>&gt;) -&gt; __futures_crate::task::Poll&lt;<span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>::Item&gt;&gt; {
<a href=#37 id=37 data-nosnippet>37</a> <span class="kw">match </span><span class="self">self</span>.get_mut() {
<a href=#38 id=38 data-nosnippet>38</a> #(
<a href=#39 id=39 data-nosnippet>39</a> <span class="self">Self</span>::#generic_idents(#generic_idents) =&gt; ::std::pin::Pin::new(#generic_idents).poll_next(cx)
<a href=#40 id=40 data-nosnippet>40</a> ),<span class="kw-2">*</span>,
<a href=#41 id=41 data-nosnippet>41</a> <span class="self">Self</span>::None =&gt; <span class="macro">panic!</span>(<span class="string">"StreamEnum::None should never be polled!"</span>),
<a href=#42 id=42 data-nosnippet>42</a> }
<a href=#43 id=43 data-nosnippet>43</a> }
<a href=#44 id=44 data-nosnippet>44</a> }
<a href=#45 id=45 data-nosnippet>45</a>
<a href=#46 id=46 data-nosnippet>46</a> <span class="kw">impl</span>&lt;ITEM, #(#generic_idents),<span class="kw-2">*</span>&gt; __futures_crate::stream::Stream <span class="kw">for </span>StreamSelect&lt;#(#generic_idents),<span class="kw-2">*</span>&gt;
<a href=#47 id=47 data-nosnippet>47</a> <span class="kw">where </span>#(#generic_idents: __futures_crate::stream::Stream&lt;Item=ITEM&gt; + ::std::marker::Unpin,)*
<a href=#48 id=48 data-nosnippet>48</a> {
<a href=#49 id=49 data-nosnippet>49</a> <span class="kw">type </span>Item = ITEM;
<a href=#50 id=50 data-nosnippet>50</a>
<a href=#51 id=51 data-nosnippet>51</a> <span class="kw">fn </span>poll_next(<span class="kw-2">mut </span><span class="self">self</span>: ::std::pin::Pin&lt;<span class="kw-2">&amp;mut </span><span class="self">Self</span>&gt;, cx: <span class="kw-2">&amp;mut </span>__futures_crate::task::Context&lt;<span class="lifetime">'_</span>&gt;) -&gt; __futures_crate::task::Poll&lt;<span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>::Item&gt;&gt; {
<a href=#52 id=52 data-nosnippet>52</a> <span class="kw">let </span><span class="self">Self</span>(#(<span class="kw-2">ref mut </span>#field_idents),<span class="kw-2">*</span>) = <span class="self">self</span>.get_mut();
<a href=#53 id=53 data-nosnippet>53</a> #(
<a href=#54 id=54 data-nosnippet>54</a> <span class="kw">let </span><span class="kw-2">mut </span>#field_idents_2 = <span class="bool-val">false</span>;
<a href=#55 id=55 data-nosnippet>55</a> )*
<a href=#56 id=56 data-nosnippet>56</a> <span class="kw">let </span><span class="kw-2">mut </span>any_pending = <span class="bool-val">false</span>;
<a href=#57 id=57 data-nosnippet>57</a> {
<a href=#58 id=58 data-nosnippet>58</a> <span class="kw">let </span><span class="kw-2">mut </span>stream_array = [#(#field_idents.as_mut().map(|f| StreamEnum::#generic_idents(f)).unwrap_or(StreamEnum::None)),<span class="kw-2">*</span>];
<a href=#59 id=59 data-nosnippet>59</a> __futures_crate::async_await::shuffle(<span class="kw-2">&amp;mut </span>stream_array);
<a href=#60 id=60 data-nosnippet>60</a>
<a href=#61 id=61 data-nosnippet>61</a> <span class="kw">for </span><span class="kw-2">mut </span>s <span class="kw">in </span>stream_array {
<a href=#62 id=62 data-nosnippet>62</a> <span class="kw">if let </span>StreamEnum::None = s {
<a href=#63 id=63 data-nosnippet>63</a> <span class="kw">continue</span>;
<a href=#64 id=64 data-nosnippet>64</a> } <span class="kw">else </span>{
<a href=#65 id=65 data-nosnippet>65</a> <span class="kw">match </span>__futures_crate::stream::Stream::poll_next(::std::pin::Pin::new(<span class="kw-2">&amp;mut </span>s), cx) {
<a href=#66 id=66 data-nosnippet>66</a> r @ __futures_crate::task::Poll::Ready(<span class="prelude-val">Some</span>(<span class="kw">_</span>)) =&gt; {
<a href=#67 id=67 data-nosnippet>67</a> <span class="kw">return </span>r;
<a href=#68 id=68 data-nosnippet>68</a> },
<a href=#69 id=69 data-nosnippet>69</a> __futures_crate::task::Poll::Pending =&gt; {
<a href=#70 id=70 data-nosnippet>70</a> any_pending = <span class="bool-val">true</span>;
<a href=#71 id=71 data-nosnippet>71</a> },
<a href=#72 id=72 data-nosnippet>72</a> __futures_crate::task::Poll::Ready(<span class="prelude-val">None</span>) =&gt; {
<a href=#73 id=73 data-nosnippet>73</a> <span class="kw">match </span>s {
<a href=#74 id=74 data-nosnippet>74</a> #(
<a href=#75 id=75 data-nosnippet>75</a> StreamEnum::#generic_idents(<span class="kw">_</span>) =&gt; { #field_idents_2 = <span class="bool-val">true</span>; }
<a href=#76 id=76 data-nosnippet>76</a> ),<span class="kw-2">*</span>,
<a href=#77 id=77 data-nosnippet>77</a> StreamEnum::None =&gt; <span class="macro">panic!</span>(<span class="string">"StreamEnum::None should never be polled!"</span>),
<a href=#78 id=78 data-nosnippet>78</a> }
<a href=#79 id=79 data-nosnippet>79</a> },
<a href=#80 id=80 data-nosnippet>80</a> }
<a href=#81 id=81 data-nosnippet>81</a> }
<a href=#82 id=82 data-nosnippet>82</a> }
<a href=#83 id=83 data-nosnippet>83</a> }
<a href=#84 id=84 data-nosnippet>84</a> #(
<a href=#85 id=85 data-nosnippet>85</a> <span class="kw">if </span>#field_idents_2 {
<a href=#86 id=86 data-nosnippet>86</a> <span class="kw-2">*</span>#field_idents = <span class="prelude-val">None</span>;
<a href=#87 id=87 data-nosnippet>87</a> }
<a href=#88 id=88 data-nosnippet>88</a> )*
<a href=#89 id=89 data-nosnippet>89</a> <span class="kw">if </span>any_pending {
<a href=#90 id=90 data-nosnippet>90</a> __futures_crate::task::Poll::Pending
<a href=#91 id=91 data-nosnippet>91</a> } <span class="kw">else </span>{
<a href=#92 id=92 data-nosnippet>92</a> __futures_crate::task::Poll::Ready(<span class="prelude-val">None</span>)
<a href=#93 id=93 data-nosnippet>93</a> }
<a href=#94 id=94 data-nosnippet>94</a> }
<a href=#95 id=95 data-nosnippet>95</a>
<a href=#96 id=96 data-nosnippet>96</a> <span class="kw">fn </span>size_hint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; (usize, <span class="prelude-ty">Option</span>&lt;usize&gt;) {
<a href=#97 id=97 data-nosnippet>97</a> <span class="kw">let </span><span class="kw-2">mut </span>s = (<span class="number">0</span>, <span class="prelude-val">Some</span>(<span class="number">0</span>));
<a href=#98 id=98 data-nosnippet>98</a> #(
<a href=#99 id=99 data-nosnippet>99</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(new_hint) = <span class="self">self</span>.#field_indices.as_ref().map(|s| s.size_hint()) {
<a href=#100 id=100 data-nosnippet>100</a> s.<span class="number">0 </span>+= new_hint.<span class="number">0</span>;
<a href=#101 id=101 data-nosnippet>101</a> <span class="comment">// We can change this out for `.zip` when the MSRV is 1.46.0 or higher.
<a href=#102 id=102 data-nosnippet>102</a> </span>s.<span class="number">1 </span>= s.<span class="number">1</span>.and_then(|a| new_hint.<span class="number">1</span>.map(|b| a + b));
<a href=#103 id=103 data-nosnippet>103</a> }
<a href=#104 id=104 data-nosnippet>104</a> )*
<a href=#105 id=105 data-nosnippet>105</a> s
<a href=#106 id=106 data-nosnippet>106</a> }
<a href=#107 id=107 data-nosnippet>107</a> }
<a href=#108 id=108 data-nosnippet>108</a>
<a href=#109 id=109 data-nosnippet>109</a> StreamSelect(#(<span class="prelude-val">Some</span>(#args)),<span class="kw-2">*</span>)
<a href=#110 id=110 data-nosnippet>110</a>
<a href=#111 id=111 data-nosnippet>111</a> }
<a href=#112 id=112 data-nosnippet>112</a> })
<a href=#113 id=113 data-nosnippet>113</a>}
</code></pre></div></section></main></body></html>