| <!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 `crates/edition/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" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-aa0817cf.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="edition" data-themes="" data-resource-suffix="" data-rustdoc-version="1.90.0 (1159e78c4 2025-09-14)" data-channel="1.90.0" data-search-js="search-fa3e91e5.js" data-settings-js="settings-5514c975.js" ><script src="../../static.files/storage-68b7e25d.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-eebb9057.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-32bb7600.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-6580c154.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><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">edition/</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 edition of the Rust language used in a crate. |
| <a href=#2 id=2 data-nosnippet>2</a></span><span class="comment">// This should live in a separate crate because we use it in both actual code and codegen. |
| <a href=#3 id=3 data-nosnippet>3</a></span><span class="kw">use </span>std::fmt; |
| <a href=#4 id=4 data-nosnippet>4</a> |
| <a href=#5 id=5 data-nosnippet>5</a><span class="attr">#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)] |
| <a href=#6 id=6 data-nosnippet>6</a>#[repr(u8)] |
| <a href=#7 id=7 data-nosnippet>7</a></span><span class="kw">pub enum </span>Edition { |
| <a href=#8 id=8 data-nosnippet>8</a> <span class="comment">// The syntax context stuff needs the discriminants to start from 0 and be consecutive. |
| <a href=#9 id=9 data-nosnippet>9</a> </span>Edition2015 = <span class="number">0</span>, |
| <a href=#10 id=10 data-nosnippet>10</a> Edition2018, |
| <a href=#11 id=11 data-nosnippet>11</a> Edition2021, |
| <a href=#12 id=12 data-nosnippet>12</a> Edition2024, |
| <a href=#13 id=13 data-nosnippet>13</a>} |
| <a href=#14 id=14 data-nosnippet>14</a> |
| <a href=#15 id=15 data-nosnippet>15</a><span class="kw">impl </span>Edition { |
| <a href=#16 id=16 data-nosnippet>16</a> <span class="kw">pub const </span>DEFAULT: Edition = Edition::Edition2015; |
| <a href=#17 id=17 data-nosnippet>17</a> <span class="kw">pub const </span>LATEST: Edition = Edition::Edition2024; |
| <a href=#18 id=18 data-nosnippet>18</a> <span class="kw">pub const </span>CURRENT: Edition = Edition::Edition2024; |
| <a href=#19 id=19 data-nosnippet>19</a> <span class="doccomment">/// The current latest stable edition, note this is usually not the right choice in code. |
| <a href=#20 id=20 data-nosnippet>20</a> </span><span class="kw">pub const </span>CURRENT_FIXME: Edition = Edition::Edition2024; |
| <a href=#21 id=21 data-nosnippet>21</a> |
| <a href=#22 id=22 data-nosnippet>22</a> <span class="kw">pub fn </span>from_u32(u32: u32) -> Edition { |
| <a href=#23 id=23 data-nosnippet>23</a> <span class="kw">match </span>u32 { |
| <a href=#24 id=24 data-nosnippet>24</a> <span class="number">0 </span>=> Edition::Edition2015, |
| <a href=#25 id=25 data-nosnippet>25</a> <span class="number">1 </span>=> Edition::Edition2018, |
| <a href=#26 id=26 data-nosnippet>26</a> <span class="number">2 </span>=> Edition::Edition2021, |
| <a href=#27 id=27 data-nosnippet>27</a> <span class="number">3 </span>=> Edition::Edition2024, |
| <a href=#28 id=28 data-nosnippet>28</a> <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"invalid edition"</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> |
| <a href=#32 id=32 data-nosnippet>32</a> <span class="kw">pub fn </span>at_least_2024(<span class="self">self</span>) -> bool { |
| <a href=#33 id=33 data-nosnippet>33</a> <span class="self">self </span>>= Edition::Edition2024 |
| <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="kw">pub fn </span>at_least_2021(<span class="self">self</span>) -> bool { |
| <a href=#37 id=37 data-nosnippet>37</a> <span class="self">self </span>>= Edition::Edition2021 |
| <a href=#38 id=38 data-nosnippet>38</a> } |
| <a href=#39 id=39 data-nosnippet>39</a> |
| <a href=#40 id=40 data-nosnippet>40</a> <span class="kw">pub fn </span>at_least_2018(<span class="self">self</span>) -> bool { |
| <a href=#41 id=41 data-nosnippet>41</a> <span class="self">self </span>>= Edition::Edition2018 |
| <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> <span class="kw">pub fn </span>number(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <a href=#45 id=45 data-nosnippet>45</a> <span class="kw">match </span><span class="self">self </span>{ |
| <a href=#46 id=46 data-nosnippet>46</a> Edition::Edition2015 => <span class="number">2015</span>, |
| <a href=#47 id=47 data-nosnippet>47</a> Edition::Edition2018 => <span class="number">2018</span>, |
| <a href=#48 id=48 data-nosnippet>48</a> Edition::Edition2021 => <span class="number">2021</span>, |
| <a href=#49 id=49 data-nosnippet>49</a> Edition::Edition2024 => <span class="number">2024</span>, |
| <a href=#50 id=50 data-nosnippet>50</a> } |
| <a href=#51 id=51 data-nosnippet>51</a> } |
| <a href=#52 id=52 data-nosnippet>52</a> |
| <a href=#53 id=53 data-nosnippet>53</a> <span class="kw">pub fn </span>iter() -> <span class="kw">impl </span>Iterator<Item = Edition> { |
| <a href=#54 id=54 data-nosnippet>54</a> [Edition::Edition2015, Edition::Edition2018, Edition::Edition2021, Edition::Edition2024] |
| <a href=#55 id=55 data-nosnippet>55</a> .iter() |
| <a href=#56 id=56 data-nosnippet>56</a> .copied() |
| <a href=#57 id=57 data-nosnippet>57</a> } |
| <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="attr">#[derive(Debug)] |
| <a href=#61 id=61 data-nosnippet>61</a></span><span class="kw">pub struct </span>ParseEditionError { |
| <a href=#62 id=62 data-nosnippet>62</a> invalid_input: String, |
| <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">impl </span>std::error::Error <span class="kw">for </span>ParseEditionError {} |
| <a href=#66 id=66 data-nosnippet>66</a><span class="kw">impl </span>fmt::Display <span class="kw">for </span>ParseEditionError { |
| <a href=#67 id=67 data-nosnippet>67</a> <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <a href=#68 id=68 data-nosnippet>68</a> <span class="macro">write!</span>(f, <span class="string">"invalid edition: {:?}"</span>, <span class="self">self</span>.invalid_input) |
| <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> |
| <a href=#72 id=72 data-nosnippet>72</a><span class="kw">impl </span>std::str::FromStr <span class="kw">for </span>Edition { |
| <a href=#73 id=73 data-nosnippet>73</a> <span class="kw">type </span><span class="prelude-val">Err </span>= ParseEditionError; |
| <a href=#74 id=74 data-nosnippet>74</a> |
| <a href=#75 id=75 data-nosnippet>75</a> <span class="kw">fn </span>from_str(s: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, <span class="self">Self</span>::Err> { |
| <a href=#76 id=76 data-nosnippet>76</a> <span class="kw">let </span>res = <span class="kw">match </span>s { |
| <a href=#77 id=77 data-nosnippet>77</a> <span class="string">"2015" </span>=> Edition::Edition2015, |
| <a href=#78 id=78 data-nosnippet>78</a> <span class="string">"2018" </span>=> Edition::Edition2018, |
| <a href=#79 id=79 data-nosnippet>79</a> <span class="string">"2021" </span>=> Edition::Edition2021, |
| <a href=#80 id=80 data-nosnippet>80</a> <span class="string">"2024" </span>=> Edition::Edition2024, |
| <a href=#81 id=81 data-nosnippet>81</a> <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(ParseEditionError { invalid_input: s.to_owned() }), |
| <a href=#82 id=82 data-nosnippet>82</a> }; |
| <a href=#83 id=83 data-nosnippet>83</a> <span class="prelude-val">Ok</span>(res) |
| <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> |
| <a href=#87 id=87 data-nosnippet>87</a><span class="kw">impl </span>fmt::Display <span class="kw">for </span>Edition { |
| <a href=#88 id=88 data-nosnippet>88</a> <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <a href=#89 id=89 data-nosnippet>89</a> f.write_str(<span class="kw">match </span><span class="self">self </span>{ |
| <a href=#90 id=90 data-nosnippet>90</a> Edition::Edition2015 => <span class="string">"2015"</span>, |
| <a href=#91 id=91 data-nosnippet>91</a> Edition::Edition2018 => <span class="string">"2018"</span>, |
| <a href=#92 id=92 data-nosnippet>92</a> Edition::Edition2021 => <span class="string">"2021"</span>, |
| <a href=#93 id=93 data-nosnippet>93</a> Edition::Edition2024 => <span class="string">"2024"</span>, |
| <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>}</code></pre></div></section></main></body></html> |
