| <!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/hir-ty/src/traits.rs`."><title>traits.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-77263533.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="hir_ty" data-themes="" data-resource-suffix="" data-rustdoc-version="1.94.0 (4a4ef493e 2026-03-02)" data-channel="1.94.0" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-b897f86f.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-7bab91a1.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-ffcac47a.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">hir_ty/</div>traits.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">//! Trait solving using next trait solver. |
| <a href=#2 id=2 data-nosnippet>2</a> |
| <a href=#3 id=3 data-nosnippet>3</a></span><span class="kw">use </span>std::hash::Hash; |
| <a href=#4 id=4 data-nosnippet>4</a> |
| <a href=#5 id=5 data-nosnippet>5</a><span class="kw">use </span>base_db::Crate; |
| <a href=#6 id=6 data-nosnippet>6</a><span class="kw">use </span>hir_def::{ |
| <a href=#7 id=7 data-nosnippet>7</a> AdtId, AssocItemId, HasModule, ImplId, Lookup, TraitId, |
| <a href=#8 id=8 data-nosnippet>8</a> lang_item::LangItems, |
| <a href=#9 id=9 data-nosnippet>9</a> nameres::DefMap, |
| <a href=#10 id=10 data-nosnippet>10</a> signatures::{ConstFlags, EnumFlags, FnFlags, StructFlags, TraitFlags, TypeAliasFlags}, |
| <a href=#11 id=11 data-nosnippet>11</a>}; |
| <a href=#12 id=12 data-nosnippet>12</a><span class="kw">use </span>hir_expand::name::Name; |
| <a href=#13 id=13 data-nosnippet>13</a><span class="kw">use </span>intern::sym; |
| <a href=#14 id=14 data-nosnippet>14</a><span class="kw">use </span>rustc_next_trait_solver::solve::{HasChanged, SolverDelegateEvalExt}; |
| <a href=#15 id=15 data-nosnippet>15</a><span class="kw">use </span>rustc_type_ir::{ |
| <a href=#16 id=16 data-nosnippet>16</a> TypingMode, |
| <a href=#17 id=17 data-nosnippet>17</a> inherent::{AdtDef, BoundExistentialPredicates, IntoKind, Span <span class="kw">as _</span>}, |
| <a href=#18 id=18 data-nosnippet>18</a> solve::Certainty, |
| <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="kw">use </span>crate::{ |
| <a href=#22 id=22 data-nosnippet>22</a> db::HirDatabase, |
| <a href=#23 id=23 data-nosnippet>23</a> next_solver::{ |
| <a href=#24 id=24 data-nosnippet>24</a> Canonical, DbInterner, GenericArgs, Goal, ParamEnv, Predicate, SolverContext, Span, |
| <a href=#25 id=25 data-nosnippet>25</a> StoredClauses, Ty, TyKind, |
| <a href=#26 id=26 data-nosnippet>26</a> infer::{ |
| <a href=#27 id=27 data-nosnippet>27</a> DbInternerInferExt, InferCtxt, |
| <a href=#28 id=28 data-nosnippet>28</a> traits::{Obligation, ObligationCause}, |
| <a href=#29 id=29 data-nosnippet>29</a> }, |
| <a href=#30 id=30 data-nosnippet>30</a> obligation_ctxt::ObligationCtxt, |
| <a href=#31 id=31 data-nosnippet>31</a> }, |
| <a href=#32 id=32 data-nosnippet>32</a>}; |
| <a href=#33 id=33 data-nosnippet>33</a> |
| <a href=#34 id=34 data-nosnippet>34</a><span class="doccomment">/// Type for `hir`, because commonly we want both param env and a crate in an exported API. |
| <a href=#35 id=35 data-nosnippet>35</a></span><span class="attr">#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)] |
| <a href=#36 id=36 data-nosnippet>36</a></span><span class="kw">pub struct </span>ParamEnvAndCrate<<span class="lifetime">'db</span>> { |
| <a href=#37 id=37 data-nosnippet>37</a> <span class="kw">pub </span>param_env: ParamEnv<<span class="lifetime">'db</span>>, |
| <a href=#38 id=38 data-nosnippet>38</a> <span class="kw">pub </span>krate: Crate, |
| <a href=#39 id=39 data-nosnippet>39</a>} |
| <a href=#40 id=40 data-nosnippet>40</a> |
| <a href=#41 id=41 data-nosnippet>41</a><span class="kw">impl</span><<span class="lifetime">'db</span>> ParamEnvAndCrate<<span class="lifetime">'db</span>> { |
| <a href=#42 id=42 data-nosnippet>42</a> <span class="attr">#[inline] |
| <a href=#43 id=43 data-nosnippet>43</a> </span><span class="kw">pub fn </span>store(<span class="self">self</span>) -> StoredParamEnvAndCrate { |
| <a href=#44 id=44 data-nosnippet>44</a> StoredParamEnvAndCrate { param_env: <span class="self">self</span>.param_env.clauses.store(), krate: <span class="self">self</span>.krate } |
| <a href=#45 id=45 data-nosnippet>45</a> } |
| <a href=#46 id=46 data-nosnippet>46</a>} |
| <a href=#47 id=47 data-nosnippet>47</a> |
| <a href=#48 id=48 data-nosnippet>48</a><span class="attr">#[derive(Debug, Clone, PartialEq, Eq, Hash)] |
| <a href=#49 id=49 data-nosnippet>49</a></span><span class="kw">pub struct </span>StoredParamEnvAndCrate { |
| <a href=#50 id=50 data-nosnippet>50</a> param_env: StoredClauses, |
| <a href=#51 id=51 data-nosnippet>51</a> <span class="kw">pub </span>krate: Crate, |
| <a href=#52 id=52 data-nosnippet>52</a>} |
| <a href=#53 id=53 data-nosnippet>53</a> |
| <a href=#54 id=54 data-nosnippet>54</a><span class="kw">impl </span>StoredParamEnvAndCrate { |
| <a href=#55 id=55 data-nosnippet>55</a> <span class="attr">#[inline] |
| <a href=#56 id=56 data-nosnippet>56</a> </span><span class="kw">pub fn </span>param_env(<span class="kw-2">&</span><span class="self">self</span>) -> ParamEnv<<span class="lifetime">'_</span>> { |
| <a href=#57 id=57 data-nosnippet>57</a> ParamEnv { clauses: <span class="self">self</span>.param_env.as_ref() } |
| <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">#[inline] |
| <a href=#61 id=61 data-nosnippet>61</a> </span><span class="kw">pub fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> ParamEnvAndCrate<<span class="lifetime">'_</span>> { |
| <a href=#62 id=62 data-nosnippet>62</a> ParamEnvAndCrate { param_env: <span class="self">self</span>.param_env(), krate: <span class="self">self</span>.krate } |
| <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> |
| <a href=#66 id=66 data-nosnippet>66</a><span class="doccomment">/// This should be used in `hir` only. |
| <a href=#67 id=67 data-nosnippet>67</a></span><span class="kw">pub fn </span>structurally_normalize_ty<<span class="lifetime">'db</span>>( |
| <a href=#68 id=68 data-nosnippet>68</a> infcx: <span class="kw-2">&</span>InferCtxt<<span class="lifetime">'db</span>>, |
| <a href=#69 id=69 data-nosnippet>69</a> ty: Ty<<span class="lifetime">'db</span>>, |
| <a href=#70 id=70 data-nosnippet>70</a> env: ParamEnv<<span class="lifetime">'db</span>>, |
| <a href=#71 id=71 data-nosnippet>71</a>) -> Ty<<span class="lifetime">'db</span>> { |
| <a href=#72 id=72 data-nosnippet>72</a> <span class="kw">let </span>TyKind::Alias(..) = ty.kind() <span class="kw">else </span>{ <span class="kw">return </span>ty }; |
| <a href=#73 id=73 data-nosnippet>73</a> <span class="kw">let </span><span class="kw-2">mut </span>ocx = ObligationCtxt::new(infcx); |
| <a href=#74 id=74 data-nosnippet>74</a> <span class="kw">let </span>ty = ocx.structurally_normalize_ty(<span class="kw-2">&</span>ObligationCause::dummy(), env, ty).unwrap_or(ty); |
| <a href=#75 id=75 data-nosnippet>75</a> ty.replace_infer_with_error(infcx.interner) |
| <a href=#76 id=76 data-nosnippet>76</a>} |
| <a href=#77 id=77 data-nosnippet>77</a> |
| <a href=#78 id=78 data-nosnippet>78</a><span class="attr">#[derive(Clone, Debug, PartialEq)] |
| <a href=#79 id=79 data-nosnippet>79</a></span><span class="kw">pub enum </span>NextTraitSolveResult { |
| <a href=#80 id=80 data-nosnippet>80</a> Certain, |
| <a href=#81 id=81 data-nosnippet>81</a> Uncertain, |
| <a href=#82 id=82 data-nosnippet>82</a> NoSolution, |
| <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">impl </span>NextTraitSolveResult { |
| <a href=#86 id=86 data-nosnippet>86</a> <span class="kw">pub fn </span>no_solution(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <a href=#87 id=87 data-nosnippet>87</a> <span class="macro">matches!</span>(<span class="self">self</span>, NextTraitSolveResult::NoSolution) |
| <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="kw">pub fn </span>certain(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <a href=#91 id=91 data-nosnippet>91</a> <span class="macro">matches!</span>(<span class="self">self</span>, NextTraitSolveResult::Certain) |
| <a href=#92 id=92 data-nosnippet>92</a> } |
| <a href=#93 id=93 data-nosnippet>93</a> |
| <a href=#94 id=94 data-nosnippet>94</a> <span class="kw">pub fn </span>uncertain(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <a href=#95 id=95 data-nosnippet>95</a> <span class="macro">matches!</span>(<span class="self">self</span>, NextTraitSolveResult::Uncertain) |
| <a href=#96 id=96 data-nosnippet>96</a> } |
| <a href=#97 id=97 data-nosnippet>97</a>} |
| <a href=#98 id=98 data-nosnippet>98</a> |
| <a href=#99 id=99 data-nosnippet>99</a><span class="kw">pub fn </span>next_trait_solve_canonical_in_ctxt<<span class="lifetime">'db</span>>( |
| <a href=#100 id=100 data-nosnippet>100</a> infer_ctxt: <span class="kw-2">&</span>InferCtxt<<span class="lifetime">'db</span>>, |
| <a href=#101 id=101 data-nosnippet>101</a> goal: Canonical<<span class="lifetime">'db</span>, Goal<<span class="lifetime">'db</span>, Predicate<<span class="lifetime">'db</span>>>>, |
| <a href=#102 id=102 data-nosnippet>102</a>) -> NextTraitSolveResult { |
| <a href=#103 id=103 data-nosnippet>103</a> infer_ctxt.probe(|<span class="kw">_</span>| { |
| <a href=#104 id=104 data-nosnippet>104</a> <span class="kw">let </span>context = <<span class="kw-2">&</span>SolverContext<<span class="lifetime">'db</span>>>::from(infer_ctxt); |
| <a href=#105 id=105 data-nosnippet>105</a> |
| <a href=#106 id=106 data-nosnippet>106</a> <span class="macro">tracing::info!</span>(<span class="question-mark">?</span>goal); |
| <a href=#107 id=107 data-nosnippet>107</a> |
| <a href=#108 id=108 data-nosnippet>108</a> <span class="kw">let </span>(goal, var_values) = context.instantiate_canonical(<span class="kw-2">&</span>goal); |
| <a href=#109 id=109 data-nosnippet>109</a> <span class="macro">tracing::info!</span>(<span class="question-mark">?</span>var_values); |
| <a href=#110 id=110 data-nosnippet>110</a> |
| <a href=#111 id=111 data-nosnippet>111</a> <span class="kw">let </span>res = context.evaluate_root_goal(goal, Span::dummy(), <span class="prelude-val">None</span>); |
| <a href=#112 id=112 data-nosnippet>112</a> |
| <a href=#113 id=113 data-nosnippet>113</a> <span class="kw">let </span>obligation = Obligation { |
| <a href=#114 id=114 data-nosnippet>114</a> cause: ObligationCause::dummy(), |
| <a href=#115 id=115 data-nosnippet>115</a> param_env: goal.param_env, |
| <a href=#116 id=116 data-nosnippet>116</a> recursion_depth: <span class="number">0</span>, |
| <a href=#117 id=117 data-nosnippet>117</a> predicate: goal.predicate, |
| <a href=#118 id=118 data-nosnippet>118</a> }; |
| <a href=#119 id=119 data-nosnippet>119</a> infer_ctxt.inspect_evaluated_obligation(<span class="kw-2">&</span>obligation, <span class="kw-2">&</span>res, || { |
| <a href=#120 id=120 data-nosnippet>120</a> <span class="prelude-val">Some</span>(context.evaluate_root_goal_for_proof_tree(goal, Span::dummy()).<span class="number">1</span>) |
| <a href=#121 id=121 data-nosnippet>121</a> }); |
| <a href=#122 id=122 data-nosnippet>122</a> |
| <a href=#123 id=123 data-nosnippet>123</a> <span class="kw">let </span>res = res.map(|r| (r.has_changed, r.certainty)); |
| <a href=#124 id=124 data-nosnippet>124</a> |
| <a href=#125 id=125 data-nosnippet>125</a> <span class="macro">tracing::debug!</span>(<span class="string">"solve_nextsolver({:?}) => {:?}"</span>, goal, res); |
| <a href=#126 id=126 data-nosnippet>126</a> |
| <a href=#127 id=127 data-nosnippet>127</a> <span class="kw">match </span>res { |
| <a href=#128 id=128 data-nosnippet>128</a> <span class="prelude-val">Err</span>(<span class="kw">_</span>) => NextTraitSolveResult::NoSolution, |
| <a href=#129 id=129 data-nosnippet>129</a> <span class="prelude-val">Ok</span>((<span class="kw">_</span>, Certainty::Yes)) => NextTraitSolveResult::Certain, |
| <a href=#130 id=130 data-nosnippet>130</a> <span class="prelude-val">Ok</span>((<span class="kw">_</span>, Certainty::Maybe { .. })) => NextTraitSolveResult::Uncertain, |
| <a href=#131 id=131 data-nosnippet>131</a> } |
| <a href=#132 id=132 data-nosnippet>132</a> }) |
| <a href=#133 id=133 data-nosnippet>133</a>} |
| <a href=#134 id=134 data-nosnippet>134</a> |
| <a href=#135 id=135 data-nosnippet>135</a><span class="doccomment">/// Solve a trait goal using next trait solver. |
| <a href=#136 id=136 data-nosnippet>136</a></span><span class="kw">pub fn </span>next_trait_solve_in_ctxt<<span class="lifetime">'db</span>, <span class="lifetime">'a</span>>( |
| <a href=#137 id=137 data-nosnippet>137</a> infer_ctxt: <span class="kw-2">&</span><span class="lifetime">'a </span>InferCtxt<<span class="lifetime">'db</span>>, |
| <a href=#138 id=138 data-nosnippet>138</a> goal: Goal<<span class="lifetime">'db</span>, Predicate<<span class="lifetime">'db</span>>>, |
| <a href=#139 id=139 data-nosnippet>139</a>) -> <span class="prelude-ty">Result</span><(HasChanged, Certainty), rustc_type_ir::solve::NoSolution> { |
| <a href=#140 id=140 data-nosnippet>140</a> <span class="macro">tracing::info!</span>(<span class="question-mark">?</span>goal); |
| <a href=#141 id=141 data-nosnippet>141</a> |
| <a href=#142 id=142 data-nosnippet>142</a> <span class="kw">let </span>context = <<span class="kw-2">&</span>SolverContext<<span class="lifetime">'db</span>>>::from(infer_ctxt); |
| <a href=#143 id=143 data-nosnippet>143</a> |
| <a href=#144 id=144 data-nosnippet>144</a> <span class="kw">let </span>res = context.evaluate_root_goal(goal, Span::dummy(), <span class="prelude-val">None</span>); |
| <a href=#145 id=145 data-nosnippet>145</a> |
| <a href=#146 id=146 data-nosnippet>146</a> <span class="kw">let </span>obligation = Obligation { |
| <a href=#147 id=147 data-nosnippet>147</a> cause: ObligationCause::dummy(), |
| <a href=#148 id=148 data-nosnippet>148</a> param_env: goal.param_env, |
| <a href=#149 id=149 data-nosnippet>149</a> recursion_depth: <span class="number">0</span>, |
| <a href=#150 id=150 data-nosnippet>150</a> predicate: goal.predicate, |
| <a href=#151 id=151 data-nosnippet>151</a> }; |
| <a href=#152 id=152 data-nosnippet>152</a> infer_ctxt.inspect_evaluated_obligation(<span class="kw-2">&</span>obligation, <span class="kw-2">&</span>res, || { |
| <a href=#153 id=153 data-nosnippet>153</a> <span class="prelude-val">Some</span>(context.evaluate_root_goal_for_proof_tree(goal, Span::dummy()).<span class="number">1</span>) |
| <a href=#154 id=154 data-nosnippet>154</a> }); |
| <a href=#155 id=155 data-nosnippet>155</a> |
| <a href=#156 id=156 data-nosnippet>156</a> <span class="kw">let </span>res = res.map(|r| (r.has_changed, r.certainty)); |
| <a href=#157 id=157 data-nosnippet>157</a> |
| <a href=#158 id=158 data-nosnippet>158</a> <span class="macro">tracing::debug!</span>(<span class="string">"solve_nextsolver({:?}) => {:?}"</span>, goal, res); |
| <a href=#159 id=159 data-nosnippet>159</a> |
| <a href=#160 id=160 data-nosnippet>160</a> res |
| <a href=#161 id=161 data-nosnippet>161</a>} |
| <a href=#162 id=162 data-nosnippet>162</a> |
| <a href=#163 id=163 data-nosnippet>163</a><span class="attr">#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, salsa::Update)] |
| <a href=#164 id=164 data-nosnippet>164</a></span><span class="kw">pub enum </span>FnTrait { |
| <a href=#165 id=165 data-nosnippet>165</a> <span class="comment">// Warning: Order is important. If something implements `x` it should also implement |
| <a href=#166 id=166 data-nosnippet>166</a> // `y` if `y <= x`. |
| <a href=#167 id=167 data-nosnippet>167</a> </span>FnOnce, |
| <a href=#168 id=168 data-nosnippet>168</a> FnMut, |
| <a href=#169 id=169 data-nosnippet>169</a> Fn, |
| <a href=#170 id=170 data-nosnippet>170</a> |
| <a href=#171 id=171 data-nosnippet>171</a> AsyncFnOnce, |
| <a href=#172 id=172 data-nosnippet>172</a> AsyncFnMut, |
| <a href=#173 id=173 data-nosnippet>173</a> AsyncFn, |
| <a href=#174 id=174 data-nosnippet>174</a>} |
| <a href=#175 id=175 data-nosnippet>175</a> |
| <a href=#176 id=176 data-nosnippet>176</a><span class="kw">impl </span>FnTrait { |
| <a href=#177 id=177 data-nosnippet>177</a> <span class="kw">pub fn </span>method_name(<span class="self">self</span>) -> Name { |
| <a href=#178 id=178 data-nosnippet>178</a> <span class="kw">match </span><span class="self">self </span>{ |
| <a href=#179 id=179 data-nosnippet>179</a> FnTrait::FnOnce => Name::new_symbol_root(sym::call_once), |
| <a href=#180 id=180 data-nosnippet>180</a> FnTrait::FnMut => Name::new_symbol_root(sym::call_mut), |
| <a href=#181 id=181 data-nosnippet>181</a> FnTrait::Fn => Name::new_symbol_root(sym::call), |
| <a href=#182 id=182 data-nosnippet>182</a> FnTrait::AsyncFnOnce => Name::new_symbol_root(sym::async_call_once), |
| <a href=#183 id=183 data-nosnippet>183</a> FnTrait::AsyncFnMut => Name::new_symbol_root(sym::async_call_mut), |
| <a href=#184 id=184 data-nosnippet>184</a> FnTrait::AsyncFn => Name::new_symbol_root(sym::async_call), |
| <a href=#185 id=185 data-nosnippet>185</a> } |
| <a href=#186 id=186 data-nosnippet>186</a> } |
| <a href=#187 id=187 data-nosnippet>187</a> |
| <a href=#188 id=188 data-nosnippet>188</a> <span class="kw">pub fn </span>get_id(<span class="self">self</span>, lang_items: <span class="kw-2">&</span>LangItems) -> <span class="prelude-ty">Option</span><TraitId> { |
| <a href=#189 id=189 data-nosnippet>189</a> <span class="kw">match </span><span class="self">self </span>{ |
| <a href=#190 id=190 data-nosnippet>190</a> FnTrait::FnOnce => lang_items.FnOnce, |
| <a href=#191 id=191 data-nosnippet>191</a> FnTrait::FnMut => lang_items.FnMut, |
| <a href=#192 id=192 data-nosnippet>192</a> FnTrait::Fn => lang_items.Fn, |
| <a href=#193 id=193 data-nosnippet>193</a> FnTrait::AsyncFnOnce => lang_items.AsyncFnOnce, |
| <a href=#194 id=194 data-nosnippet>194</a> FnTrait::AsyncFnMut => lang_items.AsyncFnMut, |
| <a href=#195 id=195 data-nosnippet>195</a> FnTrait::AsyncFn => lang_items.AsyncFn, |
| <a href=#196 id=196 data-nosnippet>196</a> } |
| <a href=#197 id=197 data-nosnippet>197</a> } |
| <a href=#198 id=198 data-nosnippet>198</a>} |
| <a href=#199 id=199 data-nosnippet>199</a> |
| <a href=#200 id=200 data-nosnippet>200</a><span class="doccomment">/// This should not be used in `hir-ty`, only in `hir`. |
| <a href=#201 id=201 data-nosnippet>201</a></span><span class="kw">pub fn </span>implements_trait_unique<<span class="lifetime">'db</span>>( |
| <a href=#202 id=202 data-nosnippet>202</a> ty: Ty<<span class="lifetime">'db</span>>, |
| <a href=#203 id=203 data-nosnippet>203</a> db: <span class="kw-2">&</span><span class="lifetime">'db </span><span class="kw">dyn </span>HirDatabase, |
| <a href=#204 id=204 data-nosnippet>204</a> env: ParamEnvAndCrate<<span class="lifetime">'db</span>>, |
| <a href=#205 id=205 data-nosnippet>205</a> trait_: TraitId, |
| <a href=#206 id=206 data-nosnippet>206</a>) -> bool { |
| <a href=#207 id=207 data-nosnippet>207</a> implements_trait_unique_impl(db, env, trait_, <span class="kw-2">&mut </span>|infcx| { |
| <a href=#208 id=208 data-nosnippet>208</a> infcx.fill_rest_fresh_args(trait_.into(), [ty.into()]) |
| <a href=#209 id=209 data-nosnippet>209</a> }) |
| <a href=#210 id=210 data-nosnippet>210</a>} |
| <a href=#211 id=211 data-nosnippet>211</a> |
| <a href=#212 id=212 data-nosnippet>212</a><span class="doccomment">/// This should not be used in `hir-ty`, only in `hir`. |
| <a href=#213 id=213 data-nosnippet>213</a></span><span class="kw">pub fn </span>implements_trait_unique_with_args<<span class="lifetime">'db</span>>( |
| <a href=#214 id=214 data-nosnippet>214</a> db: <span class="kw-2">&</span><span class="lifetime">'db </span><span class="kw">dyn </span>HirDatabase, |
| <a href=#215 id=215 data-nosnippet>215</a> env: ParamEnvAndCrate<<span class="lifetime">'db</span>>, |
| <a href=#216 id=216 data-nosnippet>216</a> trait_: TraitId, |
| <a href=#217 id=217 data-nosnippet>217</a> args: GenericArgs<<span class="lifetime">'db</span>>, |
| <a href=#218 id=218 data-nosnippet>218</a>) -> bool { |
| <a href=#219 id=219 data-nosnippet>219</a> implements_trait_unique_impl(db, env, trait_, <span class="kw-2">&mut </span>|<span class="kw">_</span>| args) |
| <a href=#220 id=220 data-nosnippet>220</a>} |
| <a href=#221 id=221 data-nosnippet>221</a> |
| <a href=#222 id=222 data-nosnippet>222</a><span class="kw">fn </span>implements_trait_unique_impl<<span class="lifetime">'db</span>>( |
| <a href=#223 id=223 data-nosnippet>223</a> db: <span class="kw-2">&</span><span class="lifetime">'db </span><span class="kw">dyn </span>HirDatabase, |
| <a href=#224 id=224 data-nosnippet>224</a> env: ParamEnvAndCrate<<span class="lifetime">'db</span>>, |
| <a href=#225 id=225 data-nosnippet>225</a> trait_: TraitId, |
| <a href=#226 id=226 data-nosnippet>226</a> create_args: <span class="kw-2">&mut </span><span class="kw">dyn </span>FnMut(<span class="kw-2">&</span>InferCtxt<<span class="lifetime">'db</span>>) -> GenericArgs<<span class="lifetime">'db</span>>, |
| <a href=#227 id=227 data-nosnippet>227</a>) -> bool { |
| <a href=#228 id=228 data-nosnippet>228</a> <span class="kw">let </span>interner = DbInterner::new_with(db, env.krate); |
| <a href=#229 id=229 data-nosnippet>229</a> <span class="comment">// FIXME(next-solver): I believe this should be `PostAnalysis`. |
| <a href=#230 id=230 data-nosnippet>230</a> </span><span class="kw">let </span>infcx = interner.infer_ctxt().build(TypingMode::non_body_analysis()); |
| <a href=#231 id=231 data-nosnippet>231</a> |
| <a href=#232 id=232 data-nosnippet>232</a> <span class="kw">let </span>args = create_args(<span class="kw-2">&</span>infcx); |
| <a href=#233 id=233 data-nosnippet>233</a> <span class="kw">let </span>trait_ref = rustc_type_ir::TraitRef::new_from_args(interner, trait_.into(), args); |
| <a href=#234 id=234 data-nosnippet>234</a> <span class="kw">let </span>goal = Goal::new(interner, env.param_env, trait_ref); |
| <a href=#235 id=235 data-nosnippet>235</a> |
| <a href=#236 id=236 data-nosnippet>236</a> <span class="kw">let </span>result = <span class="kw">crate</span>::traits::next_trait_solve_in_ctxt(<span class="kw-2">&</span>infcx, goal); |
| <a href=#237 id=237 data-nosnippet>237</a> <span class="macro">matches!</span>(result, <span class="prelude-val">Ok</span>((<span class="kw">_</span>, Certainty::Yes))) |
| <a href=#238 id=238 data-nosnippet>238</a>} |
| <a href=#239 id=239 data-nosnippet>239</a> |
| <a href=#240 id=240 data-nosnippet>240</a><span class="kw">pub fn </span>is_inherent_impl_coherent(db: <span class="kw-2">&</span><span class="kw">dyn </span>HirDatabase, def_map: <span class="kw-2">&</span>DefMap, impl_id: ImplId) -> bool { |
| <a href=#241 id=241 data-nosnippet>241</a> <span class="kw">let </span>self_ty = db.impl_self_ty(impl_id).instantiate_identity(); |
| <a href=#242 id=242 data-nosnippet>242</a> <span class="kw">let </span>self_ty = self_ty.kind(); |
| <a href=#243 id=243 data-nosnippet>243</a> <span class="kw">let </span>impl_allowed = <span class="kw">match </span>self_ty { |
| <a href=#244 id=244 data-nosnippet>244</a> TyKind::Tuple(<span class="kw">_</span>) |
| <a href=#245 id=245 data-nosnippet>245</a> | TyKind::FnDef(<span class="kw">_</span>, <span class="kw">_</span>) |
| <a href=#246 id=246 data-nosnippet>246</a> | TyKind::Array(<span class="kw">_</span>, <span class="kw">_</span>) |
| <a href=#247 id=247 data-nosnippet>247</a> | TyKind::Never |
| <a href=#248 id=248 data-nosnippet>248</a> | TyKind::RawPtr(<span class="kw">_</span>, <span class="kw">_</span>) |
| <a href=#249 id=249 data-nosnippet>249</a> | TyKind::Ref(<span class="kw">_</span>, <span class="kw">_</span>, <span class="kw">_</span>) |
| <a href=#250 id=250 data-nosnippet>250</a> | TyKind::Slice(<span class="kw">_</span>) |
| <a href=#251 id=251 data-nosnippet>251</a> | TyKind::Str |
| <a href=#252 id=252 data-nosnippet>252</a> | TyKind::Bool |
| <a href=#253 id=253 data-nosnippet>253</a> | TyKind::Char |
| <a href=#254 id=254 data-nosnippet>254</a> | TyKind::Int(<span class="kw">_</span>) |
| <a href=#255 id=255 data-nosnippet>255</a> | TyKind::Uint(<span class="kw">_</span>) |
| <a href=#256 id=256 data-nosnippet>256</a> | TyKind::Float(<span class="kw">_</span>) => def_map.is_rustc_coherence_is_core(), |
| <a href=#257 id=257 data-nosnippet>257</a> |
| <a href=#258 id=258 data-nosnippet>258</a> TyKind::Adt(adt_def, <span class="kw">_</span>) => adt_def.def_id().<span class="number">0</span>.module(db).krate(db) == def_map.krate(), |
| <a href=#259 id=259 data-nosnippet>259</a> TyKind::Dynamic(it, <span class="kw">_</span>) => it |
| <a href=#260 id=260 data-nosnippet>260</a> .principal_def_id() |
| <a href=#261 id=261 data-nosnippet>261</a> .is_some_and(|trait_id| trait_id.<span class="number">0</span>.module(db).krate(db) == def_map.krate()), |
| <a href=#262 id=262 data-nosnippet>262</a> |
| <a href=#263 id=263 data-nosnippet>263</a> <span class="kw">_ </span>=> <span class="bool-val">true</span>, |
| <a href=#264 id=264 data-nosnippet>264</a> }; |
| <a href=#265 id=265 data-nosnippet>265</a> impl_allowed || { |
| <a href=#266 id=266 data-nosnippet>266</a> <span class="kw">let </span>rustc_has_incoherent_inherent_impls = <span class="kw">match </span>self_ty { |
| <a href=#267 id=267 data-nosnippet>267</a> TyKind::Tuple(<span class="kw">_</span>) |
| <a href=#268 id=268 data-nosnippet>268</a> | TyKind::FnDef(<span class="kw">_</span>, <span class="kw">_</span>) |
| <a href=#269 id=269 data-nosnippet>269</a> | TyKind::Array(<span class="kw">_</span>, <span class="kw">_</span>) |
| <a href=#270 id=270 data-nosnippet>270</a> | TyKind::Never |
| <a href=#271 id=271 data-nosnippet>271</a> | TyKind::RawPtr(<span class="kw">_</span>, <span class="kw">_</span>) |
| <a href=#272 id=272 data-nosnippet>272</a> | TyKind::Ref(<span class="kw">_</span>, <span class="kw">_</span>, <span class="kw">_</span>) |
| <a href=#273 id=273 data-nosnippet>273</a> | TyKind::Slice(<span class="kw">_</span>) |
| <a href=#274 id=274 data-nosnippet>274</a> | TyKind::Str |
| <a href=#275 id=275 data-nosnippet>275</a> | TyKind::Bool |
| <a href=#276 id=276 data-nosnippet>276</a> | TyKind::Char |
| <a href=#277 id=277 data-nosnippet>277</a> | TyKind::Int(<span class="kw">_</span>) |
| <a href=#278 id=278 data-nosnippet>278</a> | TyKind::Uint(<span class="kw">_</span>) |
| <a href=#279 id=279 data-nosnippet>279</a> | TyKind::Float(<span class="kw">_</span>) => <span class="bool-val">true</span>, |
| <a href=#280 id=280 data-nosnippet>280</a> |
| <a href=#281 id=281 data-nosnippet>281</a> TyKind::Adt(adt_def, <span class="kw">_</span>) => <span class="kw">match </span>adt_def.def_id().<span class="number">0 </span>{ |
| <a href=#282 id=282 data-nosnippet>282</a> hir_def::AdtId::StructId(id) => db |
| <a href=#283 id=283 data-nosnippet>283</a> .struct_signature(id) |
| <a href=#284 id=284 data-nosnippet>284</a> .flags |
| <a href=#285 id=285 data-nosnippet>285</a> .contains(StructFlags::RUSTC_HAS_INCOHERENT_INHERENT_IMPLS), |
| <a href=#286 id=286 data-nosnippet>286</a> hir_def::AdtId::UnionId(id) => db |
| <a href=#287 id=287 data-nosnippet>287</a> .union_signature(id) |
| <a href=#288 id=288 data-nosnippet>288</a> .flags |
| <a href=#289 id=289 data-nosnippet>289</a> .contains(StructFlags::RUSTC_HAS_INCOHERENT_INHERENT_IMPLS), |
| <a href=#290 id=290 data-nosnippet>290</a> hir_def::AdtId::EnumId(it) => db |
| <a href=#291 id=291 data-nosnippet>291</a> .enum_signature(it) |
| <a href=#292 id=292 data-nosnippet>292</a> .flags |
| <a href=#293 id=293 data-nosnippet>293</a> .contains(EnumFlags::RUSTC_HAS_INCOHERENT_INHERENT_IMPLS), |
| <a href=#294 id=294 data-nosnippet>294</a> }, |
| <a href=#295 id=295 data-nosnippet>295</a> TyKind::Dynamic(it, <span class="kw">_</span>) => it.principal_def_id().is_some_and(|trait_id| { |
| <a href=#296 id=296 data-nosnippet>296</a> db.trait_signature(trait_id.<span class="number">0</span>) |
| <a href=#297 id=297 data-nosnippet>297</a> .flags |
| <a href=#298 id=298 data-nosnippet>298</a> .contains(TraitFlags::RUSTC_HAS_INCOHERENT_INHERENT_IMPLS) |
| <a href=#299 id=299 data-nosnippet>299</a> }), |
| <a href=#300 id=300 data-nosnippet>300</a> |
| <a href=#301 id=301 data-nosnippet>301</a> <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| <a href=#302 id=302 data-nosnippet>302</a> }; |
| <a href=#303 id=303 data-nosnippet>303</a> <span class="kw">let </span>items = impl_id.impl_items(db); |
| <a href=#304 id=304 data-nosnippet>304</a> rustc_has_incoherent_inherent_impls |
| <a href=#305 id=305 data-nosnippet>305</a> && !items.items.is_empty() |
| <a href=#306 id=306 data-nosnippet>306</a> && items.items.iter().all(|<span class="kw-2">&</span>(<span class="kw">_</span>, assoc)| <span class="kw">match </span>assoc { |
| <a href=#307 id=307 data-nosnippet>307</a> AssocItemId::FunctionId(it) => { |
| <a href=#308 id=308 data-nosnippet>308</a> db.function_signature(it).flags.contains(FnFlags::RUSTC_ALLOW_INCOHERENT_IMPL) |
| <a href=#309 id=309 data-nosnippet>309</a> } |
| <a href=#310 id=310 data-nosnippet>310</a> AssocItemId::ConstId(it) => { |
| <a href=#311 id=311 data-nosnippet>311</a> db.const_signature(it).flags.contains(ConstFlags::RUSTC_ALLOW_INCOHERENT_IMPL) |
| <a href=#312 id=312 data-nosnippet>312</a> } |
| <a href=#313 id=313 data-nosnippet>313</a> AssocItemId::TypeAliasId(it) => db |
| <a href=#314 id=314 data-nosnippet>314</a> .type_alias_signature(it) |
| <a href=#315 id=315 data-nosnippet>315</a> .flags |
| <a href=#316 id=316 data-nosnippet>316</a> .contains(TypeAliasFlags::RUSTC_ALLOW_INCOHERENT_IMPL), |
| <a href=#317 id=317 data-nosnippet>317</a> }) |
| <a href=#318 id=318 data-nosnippet>318</a> } |
| <a href=#319 id=319 data-nosnippet>319</a>} |
| <a href=#320 id=320 data-nosnippet>320</a> |
| <a href=#321 id=321 data-nosnippet>321</a><span class="doccomment">/// Checks whether the impl satisfies the orphan rules. |
| <a href=#322 id=322 data-nosnippet>322</a>/// |
| <a href=#323 id=323 data-nosnippet>323</a>/// Given `impl<P1..=Pn> Trait<T1..=Tn> for T0`, an `impl`` is valid only if at least one of the following is true: |
| <a href=#324 id=324 data-nosnippet>324</a>/// - Trait is a local trait |
| <a href=#325 id=325 data-nosnippet>325</a>/// - All of |
| <a href=#326 id=326 data-nosnippet>326</a>/// - At least one of the types `T0..=Tn`` must be a local type. Let `Ti`` be the first such type. |
| <a href=#327 id=327 data-nosnippet>327</a>/// - No uncovered type parameters `P1..=Pn` may appear in `T0..Ti`` (excluding `Ti`) |
| <a href=#328 id=328 data-nosnippet>328</a></span><span class="kw">pub fn </span>check_orphan_rules<<span class="lifetime">'db</span>>(db: <span class="kw-2">&</span><span class="lifetime">'db </span><span class="kw">dyn </span>HirDatabase, impl_: ImplId) -> bool { |
| <a href=#329 id=329 data-nosnippet>329</a> <span class="kw">let </span><span class="prelude-val">Some</span>(impl_trait) = db.impl_trait(impl_) <span class="kw">else </span>{ |
| <a href=#330 id=330 data-nosnippet>330</a> <span class="comment">// not a trait impl |
| <a href=#331 id=331 data-nosnippet>331</a> </span><span class="kw">return </span><span class="bool-val">true</span>; |
| <a href=#332 id=332 data-nosnippet>332</a> }; |
| <a href=#333 id=333 data-nosnippet>333</a> |
| <a href=#334 id=334 data-nosnippet>334</a> <span class="kw">let </span>local_crate = impl_.lookup(db).container.krate(db); |
| <a href=#335 id=335 data-nosnippet>335</a> <span class="kw">let </span>is_local = |tgt_crate| tgt_crate == local_crate; |
| <a href=#336 id=336 data-nosnippet>336</a> |
| <a href=#337 id=337 data-nosnippet>337</a> <span class="kw">let </span>trait_ref = impl_trait.instantiate_identity(); |
| <a href=#338 id=338 data-nosnippet>338</a> <span class="kw">let </span>trait_id = trait_ref.def_id.<span class="number">0</span>; |
| <a href=#339 id=339 data-nosnippet>339</a> <span class="kw">if </span>is_local(trait_id.module(db).krate(db)) { |
| <a href=#340 id=340 data-nosnippet>340</a> <span class="comment">// trait to be implemented is local |
| <a href=#341 id=341 data-nosnippet>341</a> </span><span class="kw">return </span><span class="bool-val">true</span>; |
| <a href=#342 id=342 data-nosnippet>342</a> } |
| <a href=#343 id=343 data-nosnippet>343</a> |
| <a href=#344 id=344 data-nosnippet>344</a> <span class="kw">let </span>unwrap_fundamental = |<span class="kw-2">mut </span>ty: Ty<<span class="lifetime">'db</span>>| { |
| <a href=#345 id=345 data-nosnippet>345</a> <span class="comment">// Unwrap all layers of fundamental types with a loop. |
| <a href=#346 id=346 data-nosnippet>346</a> </span><span class="kw">loop </span>{ |
| <a href=#347 id=347 data-nosnippet>347</a> <span class="kw">match </span>ty.kind() { |
| <a href=#348 id=348 data-nosnippet>348</a> TyKind::Ref(<span class="kw">_</span>, referenced, <span class="kw">_</span>) => ty = referenced, |
| <a href=#349 id=349 data-nosnippet>349</a> TyKind::Adt(adt_def, subs) => { |
| <a href=#350 id=350 data-nosnippet>350</a> <span class="kw">let </span>AdtId::StructId(s) = adt_def.def_id().<span class="number">0 </span><span class="kw">else </span>{ |
| <a href=#351 id=351 data-nosnippet>351</a> <span class="kw">break </span>ty; |
| <a href=#352 id=352 data-nosnippet>352</a> }; |
| <a href=#353 id=353 data-nosnippet>353</a> <span class="kw">let </span>struct_signature = db.struct_signature(s); |
| <a href=#354 id=354 data-nosnippet>354</a> <span class="kw">if </span>struct_signature.flags.contains(StructFlags::FUNDAMENTAL) { |
| <a href=#355 id=355 data-nosnippet>355</a> <span class="kw">let </span>next = subs.types().next(); |
| <a href=#356 id=356 data-nosnippet>356</a> <span class="kw">match </span>next { |
| <a href=#357 id=357 data-nosnippet>357</a> <span class="prelude-val">Some</span>(it) => ty = it, |
| <a href=#358 id=358 data-nosnippet>358</a> <span class="prelude-val">None </span>=> <span class="kw">break </span>ty, |
| <a href=#359 id=359 data-nosnippet>359</a> } |
| <a href=#360 id=360 data-nosnippet>360</a> } <span class="kw">else </span>{ |
| <a href=#361 id=361 data-nosnippet>361</a> <span class="kw">break </span>ty; |
| <a href=#362 id=362 data-nosnippet>362</a> } |
| <a href=#363 id=363 data-nosnippet>363</a> } |
| <a href=#364 id=364 data-nosnippet>364</a> <span class="kw">_ </span>=> <span class="kw">break </span>ty, |
| <a href=#365 id=365 data-nosnippet>365</a> } |
| <a href=#366 id=366 data-nosnippet>366</a> } |
| <a href=#367 id=367 data-nosnippet>367</a> }; |
| <a href=#368 id=368 data-nosnippet>368</a> <span class="comment">// - At least one of the types `T0..=Tn`` must be a local type. Let `Ti`` be the first such type. |
| <a href=#369 id=369 data-nosnippet>369</a> |
| <a href=#370 id=370 data-nosnippet>370</a> // FIXME: param coverage |
| <a href=#371 id=371 data-nosnippet>371</a> // - No uncovered type parameters `P1..=Pn` may appear in `T0..Ti`` (excluding `Ti`) |
| <a href=#372 id=372 data-nosnippet>372</a> </span><span class="kw">let </span>is_not_orphan = trait_ref.args.types().any(|ty| <span class="kw">match </span>unwrap_fundamental(ty).kind() { |
| <a href=#373 id=373 data-nosnippet>373</a> TyKind::Adt(adt_def, <span class="kw">_</span>) => is_local(adt_def.def_id().<span class="number">0</span>.module(db).krate(db)), |
| <a href=#374 id=374 data-nosnippet>374</a> TyKind::Error(<span class="kw">_</span>) => <span class="bool-val">true</span>, |
| <a href=#375 id=375 data-nosnippet>375</a> TyKind::Dynamic(it, <span class="kw">_</span>) => { |
| <a href=#376 id=376 data-nosnippet>376</a> it.principal_def_id().is_some_and(|trait_id| is_local(trait_id.<span class="number">0</span>.module(db).krate(db))) |
| <a href=#377 id=377 data-nosnippet>377</a> } |
| <a href=#378 id=378 data-nosnippet>378</a> <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| <a href=#379 id=379 data-nosnippet>379</a> }); |
| <a href=#380 id=380 data-nosnippet>380</a> <span class="attr">#[allow(clippy::let_and_return)] |
| <a href=#381 id=381 data-nosnippet>381</a> </span>is_not_orphan |
| <a href=#382 id=382 data-nosnippet>382</a>} |
| </code></pre></div></section></main></body></html> |
