| <!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/dyn_compatibility.rs`."><title>dyn_compatibility.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>dyn_compatibility.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">//! Compute the dyn-compatibility of a trait |
| <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::ops::ControlFlow; |
| <a href=#4 id=4 data-nosnippet>4</a> |
| <a href=#5 id=5 data-nosnippet>5</a><span class="kw">use </span>hir_def::{ |
| <a href=#6 id=6 data-nosnippet>6</a> AssocItemId, ConstId, FunctionId, GenericDefId, HasModule, TraitId, TypeAliasId, |
| <a href=#7 id=7 data-nosnippet>7</a> TypeOrConstParamId, TypeParamId, hir::generics::LocalTypeOrConstParamId, |
| <a href=#8 id=8 data-nosnippet>8</a> nameres::crate_def_map, signatures::TraitFlags, |
| <a href=#9 id=9 data-nosnippet>9</a>}; |
| <a href=#10 id=10 data-nosnippet>10</a><span class="kw">use </span>rustc_hash::FxHashSet; |
| <a href=#11 id=11 data-nosnippet>11</a><span class="kw">use </span>rustc_type_ir::{ |
| <a href=#12 id=12 data-nosnippet>12</a> AliasTyKind, ClauseKind, PredicatePolarity, TypeSuperVisitable <span class="kw">as _</span>, TypeVisitable <span class="kw">as _</span>, |
| <a href=#13 id=13 data-nosnippet>13</a> Upcast, elaborate, inherent::IntoKind, |
| <a href=#14 id=14 data-nosnippet>14</a>}; |
| <a href=#15 id=15 data-nosnippet>15</a><span class="kw">use </span>smallvec::SmallVec; |
| <a href=#16 id=16 data-nosnippet>16</a> |
| <a href=#17 id=17 data-nosnippet>17</a><span class="kw">use </span>crate::{ |
| <a href=#18 id=18 data-nosnippet>18</a> ImplTraitId, |
| <a href=#19 id=19 data-nosnippet>19</a> db::{HirDatabase, InternedOpaqueTyId}, |
| <a href=#20 id=20 data-nosnippet>20</a> lower::{GenericPredicates, associated_ty_item_bounds}, |
| <a href=#21 id=21 data-nosnippet>21</a> next_solver::{ |
| <a href=#22 id=22 data-nosnippet>22</a> Binder, Clause, Clauses, DbInterner, EarlyBinder, GenericArgs, Goal, ParamEnv, ParamTy, |
| <a href=#23 id=23 data-nosnippet>23</a> SolverDefId, TraitPredicate, TraitRef, Ty, TypingMode, infer::DbInternerInferExt, mk_param, |
| <a href=#24 id=24 data-nosnippet>24</a> }, |
| <a href=#25 id=25 data-nosnippet>25</a> traits::next_trait_solve_in_ctxt, |
| <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="attr">#[derive(Debug, Clone, PartialEq, Eq, Hash)] |
| <a href=#29 id=29 data-nosnippet>29</a></span><span class="kw">pub enum </span>DynCompatibilityViolation { |
| <a href=#30 id=30 data-nosnippet>30</a> SizedSelf, |
| <a href=#31 id=31 data-nosnippet>31</a> SelfReferential, |
| <a href=#32 id=32 data-nosnippet>32</a> Method(FunctionId, MethodViolationCode), |
| <a href=#33 id=33 data-nosnippet>33</a> AssocConst(ConstId), |
| <a href=#34 id=34 data-nosnippet>34</a> GAT(TypeAliasId), |
| <a href=#35 id=35 data-nosnippet>35</a> <span class="comment">// This doesn't exist in rustc, but added for better visualization |
| <a href=#36 id=36 data-nosnippet>36</a> </span>HasNonCompatibleSuperTrait(TraitId), |
| <a href=#37 id=37 data-nosnippet>37</a>} |
| <a href=#38 id=38 data-nosnippet>38</a> |
| <a href=#39 id=39 data-nosnippet>39</a><span class="attr">#[derive(Debug, Clone, PartialEq, Eq, Hash)] |
| <a href=#40 id=40 data-nosnippet>40</a></span><span class="kw">pub enum </span>MethodViolationCode { |
| <a href=#41 id=41 data-nosnippet>41</a> StaticMethod, |
| <a href=#42 id=42 data-nosnippet>42</a> ReferencesSelfInput, |
| <a href=#43 id=43 data-nosnippet>43</a> ReferencesSelfOutput, |
| <a href=#44 id=44 data-nosnippet>44</a> ReferencesImplTraitInTrait, |
| <a href=#45 id=45 data-nosnippet>45</a> AsyncFn, |
| <a href=#46 id=46 data-nosnippet>46</a> WhereClauseReferencesSelf, |
| <a href=#47 id=47 data-nosnippet>47</a> Generic, |
| <a href=#48 id=48 data-nosnippet>48</a> UndispatchableReceiver, |
| <a href=#49 id=49 data-nosnippet>49</a>} |
| <a href=#50 id=50 data-nosnippet>50</a> |
| <a href=#51 id=51 data-nosnippet>51</a><span class="kw">pub fn </span>dyn_compatibility( |
| <a href=#52 id=52 data-nosnippet>52</a> db: <span class="kw-2">&</span><span class="kw">dyn </span>HirDatabase, |
| <a href=#53 id=53 data-nosnippet>53</a> trait_: TraitId, |
| <a href=#54 id=54 data-nosnippet>54</a>) -> <span class="prelude-ty">Option</span><DynCompatibilityViolation> { |
| <a href=#55 id=55 data-nosnippet>55</a> <span class="kw">let </span>interner = DbInterner::new_no_crate(db); |
| <a href=#56 id=56 data-nosnippet>56</a> <span class="kw">for </span>super_trait <span class="kw">in </span>elaborate::supertrait_def_ids(interner, trait_.into()) { |
| <a href=#57 id=57 data-nosnippet>57</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(v) = db.dyn_compatibility_of_trait(super_trait.<span class="number">0</span>) { |
| <a href=#58 id=58 data-nosnippet>58</a> <span class="kw">return if </span>super_trait.<span class="number">0 </span>== trait_ { |
| <a href=#59 id=59 data-nosnippet>59</a> <span class="prelude-val">Some</span>(v) |
| <a href=#60 id=60 data-nosnippet>60</a> } <span class="kw">else </span>{ |
| <a href=#61 id=61 data-nosnippet>61</a> <span class="prelude-val">Some</span>(DynCompatibilityViolation::HasNonCompatibleSuperTrait(super_trait.<span class="number">0</span>)) |
| <a href=#62 id=62 data-nosnippet>62</a> }; |
| <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="prelude-val">None |
| <a href=#67 id=67 data-nosnippet>67</a></span>} |
| <a href=#68 id=68 data-nosnippet>68</a> |
| <a href=#69 id=69 data-nosnippet>69</a><span class="kw">pub fn </span>dyn_compatibility_with_callback<F>( |
| <a href=#70 id=70 data-nosnippet>70</a> db: <span class="kw-2">&</span><span class="kw">dyn </span>HirDatabase, |
| <a href=#71 id=71 data-nosnippet>71</a> trait_: TraitId, |
| <a href=#72 id=72 data-nosnippet>72</a> cb: <span class="kw-2">&mut </span>F, |
| <a href=#73 id=73 data-nosnippet>73</a>) -> ControlFlow<()> |
| <a href=#74 id=74 data-nosnippet>74</a><span class="kw">where |
| <a href=#75 id=75 data-nosnippet>75</a> </span>F: FnMut(DynCompatibilityViolation) -> ControlFlow<()>, |
| <a href=#76 id=76 data-nosnippet>76</a>{ |
| <a href=#77 id=77 data-nosnippet>77</a> <span class="kw">let </span>interner = DbInterner::new_no_crate(db); |
| <a href=#78 id=78 data-nosnippet>78</a> <span class="kw">for </span>super_trait <span class="kw">in </span>elaborate::supertrait_def_ids(interner, trait_.into()).skip(<span class="number">1</span>) { |
| <a href=#79 id=79 data-nosnippet>79</a> <span class="kw">if </span>db.dyn_compatibility_of_trait(super_trait.<span class="number">0</span>).is_some() { |
| <a href=#80 id=80 data-nosnippet>80</a> cb(DynCompatibilityViolation::HasNonCompatibleSuperTrait(trait_))<span class="question-mark">?</span>; |
| <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> dyn_compatibility_of_trait_with_callback(db, trait_, cb) |
| <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">pub fn </span>dyn_compatibility_of_trait_with_callback<F>( |
| <a href=#88 id=88 data-nosnippet>88</a> db: <span class="kw-2">&</span><span class="kw">dyn </span>HirDatabase, |
| <a href=#89 id=89 data-nosnippet>89</a> trait_: TraitId, |
| <a href=#90 id=90 data-nosnippet>90</a> cb: <span class="kw-2">&mut </span>F, |
| <a href=#91 id=91 data-nosnippet>91</a>) -> ControlFlow<()> |
| <a href=#92 id=92 data-nosnippet>92</a><span class="kw">where |
| <a href=#93 id=93 data-nosnippet>93</a> </span>F: FnMut(DynCompatibilityViolation) -> ControlFlow<()>, |
| <a href=#94 id=94 data-nosnippet>94</a>{ |
| <a href=#95 id=95 data-nosnippet>95</a> <span class="comment">// Check whether this has a `Sized` bound |
| <a href=#96 id=96 data-nosnippet>96</a> </span><span class="kw">if </span>generics_require_sized_self(db, trait_.into()) { |
| <a href=#97 id=97 data-nosnippet>97</a> cb(DynCompatibilityViolation::SizedSelf)<span class="question-mark">?</span>; |
| <a href=#98 id=98 data-nosnippet>98</a> } |
| <a href=#99 id=99 data-nosnippet>99</a> |
| <a href=#100 id=100 data-nosnippet>100</a> <span class="comment">// Check if there exist bounds that referencing self |
| <a href=#101 id=101 data-nosnippet>101</a> </span><span class="kw">if </span>predicates_reference_self(db, trait_) { |
| <a href=#102 id=102 data-nosnippet>102</a> cb(DynCompatibilityViolation::SelfReferential)<span class="question-mark">?</span>; |
| <a href=#103 id=103 data-nosnippet>103</a> } |
| <a href=#104 id=104 data-nosnippet>104</a> <span class="kw">if </span>bounds_reference_self(db, trait_) { |
| <a href=#105 id=105 data-nosnippet>105</a> cb(DynCompatibilityViolation::SelfReferential)<span class="question-mark">?</span>; |
| <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> <span class="comment">// rustc checks for non-lifetime binders here, but we don't support HRTB yet |
| <a href=#109 id=109 data-nosnippet>109</a> |
| <a href=#110 id=110 data-nosnippet>110</a> </span><span class="kw">let </span>trait_data = trait_.trait_items(db); |
| <a href=#111 id=111 data-nosnippet>111</a> <span class="kw">for </span>(<span class="kw">_</span>, assoc_item) <span class="kw">in </span><span class="kw-2">&</span>trait_data.items { |
| <a href=#112 id=112 data-nosnippet>112</a> dyn_compatibility_violation_for_assoc_item(db, trait_, <span class="kw-2">*</span>assoc_item, cb)<span class="question-mark">?</span>; |
| <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> ControlFlow::Continue(()) |
| <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><span class="kw">pub fn </span>dyn_compatibility_of_trait_query( |
| <a href=#119 id=119 data-nosnippet>119</a> db: <span class="kw-2">&</span><span class="kw">dyn </span>HirDatabase, |
| <a href=#120 id=120 data-nosnippet>120</a> trait_: TraitId, |
| <a href=#121 id=121 data-nosnippet>121</a>) -> <span class="prelude-ty">Option</span><DynCompatibilityViolation> { |
| <a href=#122 id=122 data-nosnippet>122</a> <span class="kw">let </span><span class="kw-2">mut </span>res = <span class="prelude-val">None</span>; |
| <a href=#123 id=123 data-nosnippet>123</a> <span class="kw">_ </span>= dyn_compatibility_of_trait_with_callback(db, trait_, <span class="kw-2">&mut </span>|osv| { |
| <a href=#124 id=124 data-nosnippet>124</a> res = <span class="prelude-val">Some</span>(osv); |
| <a href=#125 id=125 data-nosnippet>125</a> ControlFlow::Break(()) |
| <a href=#126 id=126 data-nosnippet>126</a> }); |
| <a href=#127 id=127 data-nosnippet>127</a> |
| <a href=#128 id=128 data-nosnippet>128</a> res |
| <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">pub fn </span>generics_require_sized_self(db: <span class="kw-2">&</span><span class="kw">dyn </span>HirDatabase, def: GenericDefId) -> bool { |
| <a href=#132 id=132 data-nosnippet>132</a> <span class="kw">let </span>krate = def.module(db).krate(db); |
| <a href=#133 id=133 data-nosnippet>133</a> <span class="kw">let </span>interner = DbInterner::new_with(db, krate); |
| <a href=#134 id=134 data-nosnippet>134</a> <span class="kw">let </span><span class="prelude-val">Some</span>(sized) = interner.lang_items().Sized <span class="kw">else </span>{ |
| <a href=#135 id=135 data-nosnippet>135</a> <span class="kw">return </span><span class="bool-val">false</span>; |
| <a href=#136 id=136 data-nosnippet>136</a> }; |
| <a href=#137 id=137 data-nosnippet>137</a> |
| <a href=#138 id=138 data-nosnippet>138</a> <span class="kw">let </span>predicates = GenericPredicates::query_explicit(db, def); |
| <a href=#139 id=139 data-nosnippet>139</a> <span class="comment">// FIXME: We should use `explicit_predicates_of` here, which hasn't been implemented to |
| <a href=#140 id=140 data-nosnippet>140</a> // rust-analyzer yet |
| <a href=#141 id=141 data-nosnippet>141</a> // https://github.com/rust-lang/rust/blob/ddaf12390d3ffb7d5ba74491a48f3cd528e5d777/compiler/rustc_hir_analysis/src/collect/predicates_of.rs#L490 |
| <a href=#142 id=142 data-nosnippet>142</a> </span>elaborate::elaborate(interner, predicates.iter_identity_copied()).any(|pred| { |
| <a href=#143 id=143 data-nosnippet>143</a> <span class="kw">match </span>pred.kind().skip_binder() { |
| <a href=#144 id=144 data-nosnippet>144</a> ClauseKind::Trait(trait_pred) => { |
| <a href=#145 id=145 data-nosnippet>145</a> <span class="kw">if </span>sized == trait_pred.def_id().<span class="number">0 |
| <a href=#146 id=146 data-nosnippet>146</a> </span>&& <span class="kw">let </span>rustc_type_ir::TyKind::Param(param_ty) = |
| <a href=#147 id=147 data-nosnippet>147</a> trait_pred.trait_ref.self_ty().kind() |
| <a href=#148 id=148 data-nosnippet>148</a> && param_ty.index == <span class="number">0 |
| <a href=#149 id=149 data-nosnippet>149</a> </span>{ |
| <a href=#150 id=150 data-nosnippet>150</a> <span class="bool-val">true |
| <a href=#151 id=151 data-nosnippet>151</a> </span>} <span class="kw">else </span>{ |
| <a href=#152 id=152 data-nosnippet>152</a> <span class="bool-val">false |
| <a href=#153 id=153 data-nosnippet>153</a> </span>} |
| <a href=#154 id=154 data-nosnippet>154</a> } |
| <a href=#155 id=155 data-nosnippet>155</a> <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| <a href=#156 id=156 data-nosnippet>156</a> } |
| <a href=#157 id=157 data-nosnippet>157</a> }) |
| <a href=#158 id=158 data-nosnippet>158</a>} |
| <a href=#159 id=159 data-nosnippet>159</a> |
| <a href=#160 id=160 data-nosnippet>160</a><span class="comment">// rustc gathers all the spans that references `Self` for error rendering, |
| <a href=#161 id=161 data-nosnippet>161</a>// but we don't have good way to render such locations. |
| <a href=#162 id=162 data-nosnippet>162</a>// So, just return single boolean value for existence of such `Self` reference |
| <a href=#163 id=163 data-nosnippet>163</a></span><span class="kw">fn </span>predicates_reference_self(db: <span class="kw-2">&</span><span class="kw">dyn </span>HirDatabase, trait_: TraitId) -> bool { |
| <a href=#164 id=164 data-nosnippet>164</a> GenericPredicates::query_explicit(db, trait_.into()) |
| <a href=#165 id=165 data-nosnippet>165</a> .iter_identity_copied() |
| <a href=#166 id=166 data-nosnippet>166</a> .any(|pred| predicate_references_self(db, trait_, pred, AllowSelfProjection::No)) |
| <a href=#167 id=167 data-nosnippet>167</a>} |
| <a href=#168 id=168 data-nosnippet>168</a> |
| <a href=#169 id=169 data-nosnippet>169</a><span class="comment">// Same as the above, `predicates_reference_self` |
| <a href=#170 id=170 data-nosnippet>170</a></span><span class="kw">fn </span>bounds_reference_self(db: <span class="kw-2">&</span><span class="kw">dyn </span>HirDatabase, trait_: TraitId) -> bool { |
| <a href=#171 id=171 data-nosnippet>171</a> <span class="kw">let </span>trait_data = trait_.trait_items(db); |
| <a href=#172 id=172 data-nosnippet>172</a> trait_data |
| <a href=#173 id=173 data-nosnippet>173</a> .items |
| <a href=#174 id=174 data-nosnippet>174</a> .iter() |
| <a href=#175 id=175 data-nosnippet>175</a> .filter_map(|(<span class="kw">_</span>, it)| <span class="kw">match </span><span class="kw-2">*</span>it { |
| <a href=#176 id=176 data-nosnippet>176</a> AssocItemId::TypeAliasId(id) => <span class="prelude-val">Some</span>(associated_ty_item_bounds(db, id)), |
| <a href=#177 id=177 data-nosnippet>177</a> <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| <a href=#178 id=178 data-nosnippet>178</a> }) |
| <a href=#179 id=179 data-nosnippet>179</a> .any(|bounds| { |
| <a href=#180 id=180 data-nosnippet>180</a> bounds.skip_binder().iter().any(|pred| <span class="kw">match </span>pred.skip_binder() { |
| <a href=#181 id=181 data-nosnippet>181</a> rustc_type_ir::ExistentialPredicate::Trait(it) => it.args.iter().any(|arg| { |
| <a href=#182 id=182 data-nosnippet>182</a> contains_illegal_self_type_reference(db, trait_, <span class="kw-2">&</span>arg, AllowSelfProjection::Yes) |
| <a href=#183 id=183 data-nosnippet>183</a> }), |
| <a href=#184 id=184 data-nosnippet>184</a> rustc_type_ir::ExistentialPredicate::Projection(it) => it.args.iter().any(|arg| { |
| <a href=#185 id=185 data-nosnippet>185</a> contains_illegal_self_type_reference(db, trait_, <span class="kw-2">&</span>arg, AllowSelfProjection::Yes) |
| <a href=#186 id=186 data-nosnippet>186</a> }), |
| <a href=#187 id=187 data-nosnippet>187</a> rustc_type_ir::ExistentialPredicate::AutoTrait(<span class="kw">_</span>) => <span class="bool-val">false</span>, |
| <a href=#188 id=188 data-nosnippet>188</a> }) |
| <a href=#189 id=189 data-nosnippet>189</a> }) |
| <a href=#190 id=190 data-nosnippet>190</a>} |
| <a href=#191 id=191 data-nosnippet>191</a> |
| <a href=#192 id=192 data-nosnippet>192</a><span class="attr">#[derive(Clone, Copy)] |
| <a href=#193 id=193 data-nosnippet>193</a></span><span class="kw">enum </span>AllowSelfProjection { |
| <a href=#194 id=194 data-nosnippet>194</a> Yes, |
| <a href=#195 id=195 data-nosnippet>195</a> No, |
| <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><span class="kw">fn </span>predicate_references_self<<span class="lifetime">'db</span>>( |
| <a href=#199 id=199 data-nosnippet>199</a> db: <span class="kw-2">&</span><span class="lifetime">'db </span><span class="kw">dyn </span>HirDatabase, |
| <a href=#200 id=200 data-nosnippet>200</a> trait_: TraitId, |
| <a href=#201 id=201 data-nosnippet>201</a> predicate: Clause<<span class="lifetime">'db</span>>, |
| <a href=#202 id=202 data-nosnippet>202</a> allow_self_projection: AllowSelfProjection, |
| <a href=#203 id=203 data-nosnippet>203</a>) -> bool { |
| <a href=#204 id=204 data-nosnippet>204</a> <span class="kw">match </span>predicate.kind().skip_binder() { |
| <a href=#205 id=205 data-nosnippet>205</a> ClauseKind::Trait(trait_pred) => trait_pred.trait_ref.args.iter().skip(<span class="number">1</span>).any(|arg| { |
| <a href=#206 id=206 data-nosnippet>206</a> contains_illegal_self_type_reference(db, trait_, <span class="kw-2">&</span>arg, allow_self_projection) |
| <a href=#207 id=207 data-nosnippet>207</a> }), |
| <a href=#208 id=208 data-nosnippet>208</a> ClauseKind::Projection(proj_pred) => { |
| <a href=#209 id=209 data-nosnippet>209</a> proj_pred.projection_term.args.iter().skip(<span class="number">1</span>).any(|arg| { |
| <a href=#210 id=210 data-nosnippet>210</a> contains_illegal_self_type_reference(db, trait_, <span class="kw-2">&</span>arg, allow_self_projection) |
| <a href=#211 id=211 data-nosnippet>211</a> }) |
| <a href=#212 id=212 data-nosnippet>212</a> } |
| <a href=#213 id=213 data-nosnippet>213</a> <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| <a href=#214 id=214 data-nosnippet>214</a> } |
| <a href=#215 id=215 data-nosnippet>215</a>} |
| <a href=#216 id=216 data-nosnippet>216</a> |
| <a href=#217 id=217 data-nosnippet>217</a><span class="kw">fn </span>contains_illegal_self_type_reference<<span class="lifetime">'db</span>, T: rustc_type_ir::TypeVisitable<DbInterner<<span class="lifetime">'db</span>>>>( |
| <a href=#218 id=218 data-nosnippet>218</a> db: <span class="kw-2">&</span><span class="lifetime">'db </span><span class="kw">dyn </span>HirDatabase, |
| <a href=#219 id=219 data-nosnippet>219</a> trait_: TraitId, |
| <a href=#220 id=220 data-nosnippet>220</a> t: <span class="kw-2">&</span>T, |
| <a href=#221 id=221 data-nosnippet>221</a> allow_self_projection: AllowSelfProjection, |
| <a href=#222 id=222 data-nosnippet>222</a>) -> bool { |
| <a href=#223 id=223 data-nosnippet>223</a> <span class="kw">struct </span>IllegalSelfTypeVisitor<<span class="lifetime">'db</span>> { |
| <a href=#224 id=224 data-nosnippet>224</a> db: <span class="kw-2">&</span><span class="lifetime">'db </span><span class="kw">dyn </span>HirDatabase, |
| <a href=#225 id=225 data-nosnippet>225</a> trait_: TraitId, |
| <a href=#226 id=226 data-nosnippet>226</a> super_traits: <span class="prelude-ty">Option</span><SmallVec<[TraitId; <span class="number">4</span>]>>, |
| <a href=#227 id=227 data-nosnippet>227</a> allow_self_projection: AllowSelfProjection, |
| <a href=#228 id=228 data-nosnippet>228</a> } |
| <a href=#229 id=229 data-nosnippet>229</a> <span class="kw">impl</span><<span class="lifetime">'db</span>> rustc_type_ir::TypeVisitor<DbInterner<<span class="lifetime">'db</span>>> <span class="kw">for </span>IllegalSelfTypeVisitor<<span class="lifetime">'db</span>> { |
| <a href=#230 id=230 data-nosnippet>230</a> <span class="kw">type </span><span class="prelude-ty">Result </span>= ControlFlow<()>; |
| <a href=#231 id=231 data-nosnippet>231</a> |
| <a href=#232 id=232 data-nosnippet>232</a> <span class="kw">fn </span>visit_ty( |
| <a href=#233 id=233 data-nosnippet>233</a> <span class="kw-2">&mut </span><span class="self">self</span>, |
| <a href=#234 id=234 data-nosnippet>234</a> ty: <DbInterner<<span class="lifetime">'db</span>> <span class="kw">as </span>rustc_type_ir::Interner>::Ty, |
| <a href=#235 id=235 data-nosnippet>235</a> ) -> <span class="self">Self</span>::Result { |
| <a href=#236 id=236 data-nosnippet>236</a> <span class="kw">let </span>interner = DbInterner::new_no_crate(<span class="self">self</span>.db); |
| <a href=#237 id=237 data-nosnippet>237</a> <span class="kw">match </span>ty.kind() { |
| <a href=#238 id=238 data-nosnippet>238</a> rustc_type_ir::TyKind::Param(param) <span class="kw">if </span>param.index == <span class="number">0 </span>=> ControlFlow::Break(()), |
| <a href=#239 id=239 data-nosnippet>239</a> rustc_type_ir::TyKind::Param(<span class="kw">_</span>) => ControlFlow::Continue(()), |
| <a href=#240 id=240 data-nosnippet>240</a> rustc_type_ir::TyKind::Alias(AliasTyKind::Projection, proj) => { |
| <a href=#241 id=241 data-nosnippet>241</a> <span class="kw">match </span><span class="self">self</span>.allow_self_projection { |
| <a href=#242 id=242 data-nosnippet>242</a> AllowSelfProjection::Yes => { |
| <a href=#243 id=243 data-nosnippet>243</a> <span class="kw">let </span>trait_ = proj.trait_def_id(interner); |
| <a href=#244 id=244 data-nosnippet>244</a> <span class="kw">let </span>trait_ = <span class="kw">match </span>trait_ { |
| <a href=#245 id=245 data-nosnippet>245</a> SolverDefId::TraitId(id) => id, |
| <a href=#246 id=246 data-nosnippet>246</a> <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(), |
| <a href=#247 id=247 data-nosnippet>247</a> }; |
| <a href=#248 id=248 data-nosnippet>248</a> <span class="kw">if </span><span class="self">self</span>.super_traits.is_none() { |
| <a href=#249 id=249 data-nosnippet>249</a> <span class="self">self</span>.super_traits = <span class="prelude-val">Some</span>( |
| <a href=#250 id=250 data-nosnippet>250</a> elaborate::supertrait_def_ids(interner, <span class="self">self</span>.trait_.into()) |
| <a href=#251 id=251 data-nosnippet>251</a> .map(|super_trait| super_trait.<span class="number">0</span>) |
| <a href=#252 id=252 data-nosnippet>252</a> .collect(), |
| <a href=#253 id=253 data-nosnippet>253</a> ) |
| <a href=#254 id=254 data-nosnippet>254</a> } |
| <a href=#255 id=255 data-nosnippet>255</a> <span class="kw">if </span><span class="self">self</span>.super_traits.as_ref().is_some_and(|s| s.contains(<span class="kw-2">&</span>trait_)) { |
| <a href=#256 id=256 data-nosnippet>256</a> ControlFlow::Continue(()) |
| <a href=#257 id=257 data-nosnippet>257</a> } <span class="kw">else </span>{ |
| <a href=#258 id=258 data-nosnippet>258</a> ty.super_visit_with(<span class="self">self</span>) |
| <a href=#259 id=259 data-nosnippet>259</a> } |
| <a href=#260 id=260 data-nosnippet>260</a> } |
| <a href=#261 id=261 data-nosnippet>261</a> AllowSelfProjection::No => ty.super_visit_with(<span class="self">self</span>), |
| <a href=#262 id=262 data-nosnippet>262</a> } |
| <a href=#263 id=263 data-nosnippet>263</a> } |
| <a href=#264 id=264 data-nosnippet>264</a> <span class="kw">_ </span>=> ty.super_visit_with(<span class="self">self</span>), |
| <a href=#265 id=265 data-nosnippet>265</a> } |
| <a href=#266 id=266 data-nosnippet>266</a> } |
| <a href=#267 id=267 data-nosnippet>267</a> } |
| <a href=#268 id=268 data-nosnippet>268</a> |
| <a href=#269 id=269 data-nosnippet>269</a> <span class="kw">let </span><span class="kw-2">mut </span>visitor = |
| <a href=#270 id=270 data-nosnippet>270</a> IllegalSelfTypeVisitor { db, trait_, super_traits: <span class="prelude-val">None</span>, allow_self_projection }; |
| <a href=#271 id=271 data-nosnippet>271</a> t.visit_with(<span class="kw-2">&mut </span>visitor).is_break() |
| <a href=#272 id=272 data-nosnippet>272</a>} |
| <a href=#273 id=273 data-nosnippet>273</a> |
| <a href=#274 id=274 data-nosnippet>274</a><span class="kw">fn </span>dyn_compatibility_violation_for_assoc_item<F>( |
| <a href=#275 id=275 data-nosnippet>275</a> db: <span class="kw-2">&</span><span class="kw">dyn </span>HirDatabase, |
| <a href=#276 id=276 data-nosnippet>276</a> trait_: TraitId, |
| <a href=#277 id=277 data-nosnippet>277</a> item: AssocItemId, |
| <a href=#278 id=278 data-nosnippet>278</a> cb: <span class="kw-2">&mut </span>F, |
| <a href=#279 id=279 data-nosnippet>279</a>) -> ControlFlow<()> |
| <a href=#280 id=280 data-nosnippet>280</a><span class="kw">where |
| <a href=#281 id=281 data-nosnippet>281</a> </span>F: FnMut(DynCompatibilityViolation) -> ControlFlow<()>, |
| <a href=#282 id=282 data-nosnippet>282</a>{ |
| <a href=#283 id=283 data-nosnippet>283</a> <span class="comment">// Any item that has a `Self : Sized` requisite is otherwise |
| <a href=#284 id=284 data-nosnippet>284</a> // exempt from the regulations. |
| <a href=#285 id=285 data-nosnippet>285</a> </span><span class="kw">if </span>generics_require_sized_self(db, item.into()) { |
| <a href=#286 id=286 data-nosnippet>286</a> <span class="kw">return </span>ControlFlow::Continue(()); |
| <a href=#287 id=287 data-nosnippet>287</a> } |
| <a href=#288 id=288 data-nosnippet>288</a> |
| <a href=#289 id=289 data-nosnippet>289</a> <span class="kw">match </span>item { |
| <a href=#290 id=290 data-nosnippet>290</a> AssocItemId::ConstId(it) => cb(DynCompatibilityViolation::AssocConst(it)), |
| <a href=#291 id=291 data-nosnippet>291</a> AssocItemId::FunctionId(it) => { |
| <a href=#292 id=292 data-nosnippet>292</a> virtual_call_violations_for_method(db, trait_, it, <span class="kw-2">&mut </span>|mvc| { |
| <a href=#293 id=293 data-nosnippet>293</a> cb(DynCompatibilityViolation::Method(it, mvc)) |
| <a href=#294 id=294 data-nosnippet>294</a> }) |
| <a href=#295 id=295 data-nosnippet>295</a> } |
| <a href=#296 id=296 data-nosnippet>296</a> AssocItemId::TypeAliasId(it) => { |
| <a href=#297 id=297 data-nosnippet>297</a> <span class="kw">let </span>def_map = crate_def_map(db, trait_.krate(db)); |
| <a href=#298 id=298 data-nosnippet>298</a> <span class="kw">if </span>def_map.is_unstable_feature_enabled(<span class="kw-2">&</span>intern::sym::generic_associated_type_extended) { |
| <a href=#299 id=299 data-nosnippet>299</a> ControlFlow::Continue(()) |
| <a href=#300 id=300 data-nosnippet>300</a> } <span class="kw">else </span>{ |
| <a href=#301 id=301 data-nosnippet>301</a> <span class="kw">let </span>generic_params = db.generic_params(item.into()); |
| <a href=#302 id=302 data-nosnippet>302</a> <span class="kw">if </span>!generic_params.is_empty() { |
| <a href=#303 id=303 data-nosnippet>303</a> cb(DynCompatibilityViolation::GAT(it)) |
| <a href=#304 id=304 data-nosnippet>304</a> } <span class="kw">else </span>{ |
| <a href=#305 id=305 data-nosnippet>305</a> ControlFlow::Continue(()) |
| <a href=#306 id=306 data-nosnippet>306</a> } |
| <a href=#307 id=307 data-nosnippet>307</a> } |
| <a href=#308 id=308 data-nosnippet>308</a> } |
| <a href=#309 id=309 data-nosnippet>309</a> } |
| <a href=#310 id=310 data-nosnippet>310</a>} |
| <a href=#311 id=311 data-nosnippet>311</a> |
| <a href=#312 id=312 data-nosnippet>312</a><span class="kw">fn </span>virtual_call_violations_for_method<F>( |
| <a href=#313 id=313 data-nosnippet>313</a> db: <span class="kw-2">&</span><span class="kw">dyn </span>HirDatabase, |
| <a href=#314 id=314 data-nosnippet>314</a> trait_: TraitId, |
| <a href=#315 id=315 data-nosnippet>315</a> func: FunctionId, |
| <a href=#316 id=316 data-nosnippet>316</a> cb: <span class="kw-2">&mut </span>F, |
| <a href=#317 id=317 data-nosnippet>317</a>) -> ControlFlow<()> |
| <a href=#318 id=318 data-nosnippet>318</a><span class="kw">where |
| <a href=#319 id=319 data-nosnippet>319</a> </span>F: FnMut(MethodViolationCode) -> ControlFlow<()>, |
| <a href=#320 id=320 data-nosnippet>320</a>{ |
| <a href=#321 id=321 data-nosnippet>321</a> <span class="kw">let </span>func_data = db.function_signature(func); |
| <a href=#322 id=322 data-nosnippet>322</a> <span class="kw">if </span>!func_data.has_self_param() { |
| <a href=#323 id=323 data-nosnippet>323</a> cb(MethodViolationCode::StaticMethod)<span class="question-mark">?</span>; |
| <a href=#324 id=324 data-nosnippet>324</a> } |
| <a href=#325 id=325 data-nosnippet>325</a> |
| <a href=#326 id=326 data-nosnippet>326</a> <span class="kw">if </span>func_data.is_async() { |
| <a href=#327 id=327 data-nosnippet>327</a> cb(MethodViolationCode::AsyncFn)<span class="question-mark">?</span>; |
| <a href=#328 id=328 data-nosnippet>328</a> } |
| <a href=#329 id=329 data-nosnippet>329</a> |
| <a href=#330 id=330 data-nosnippet>330</a> <span class="kw">let </span>sig = db.callable_item_signature(func.into()); |
| <a href=#331 id=331 data-nosnippet>331</a> <span class="kw">if </span>sig.skip_binder().inputs().iter().skip(<span class="number">1</span>).any(|ty| { |
| <a href=#332 id=332 data-nosnippet>332</a> contains_illegal_self_type_reference(db, trait_, ty.skip_binder(), AllowSelfProjection::Yes) |
| <a href=#333 id=333 data-nosnippet>333</a> }) { |
| <a href=#334 id=334 data-nosnippet>334</a> cb(MethodViolationCode::ReferencesSelfInput)<span class="question-mark">?</span>; |
| <a href=#335 id=335 data-nosnippet>335</a> } |
| <a href=#336 id=336 data-nosnippet>336</a> |
| <a href=#337 id=337 data-nosnippet>337</a> <span class="kw">if </span>contains_illegal_self_type_reference( |
| <a href=#338 id=338 data-nosnippet>338</a> db, |
| <a href=#339 id=339 data-nosnippet>339</a> trait_, |
| <a href=#340 id=340 data-nosnippet>340</a> <span class="kw-2">&</span>sig.skip_binder().output(), |
| <a href=#341 id=341 data-nosnippet>341</a> AllowSelfProjection::Yes, |
| <a href=#342 id=342 data-nosnippet>342</a> ) { |
| <a href=#343 id=343 data-nosnippet>343</a> cb(MethodViolationCode::ReferencesSelfOutput)<span class="question-mark">?</span>; |
| <a href=#344 id=344 data-nosnippet>344</a> } |
| <a href=#345 id=345 data-nosnippet>345</a> |
| <a href=#346 id=346 data-nosnippet>346</a> <span class="kw">if </span>!func_data.is_async() |
| <a href=#347 id=347 data-nosnippet>347</a> && <span class="kw">let </span><span class="prelude-val">Some</span>(mvc) = contains_illegal_impl_trait_in_trait(db, <span class="kw-2">&</span>sig) |
| <a href=#348 id=348 data-nosnippet>348</a> { |
| <a href=#349 id=349 data-nosnippet>349</a> cb(mvc)<span class="question-mark">?</span>; |
| <a href=#350 id=350 data-nosnippet>350</a> } |
| <a href=#351 id=351 data-nosnippet>351</a> |
| <a href=#352 id=352 data-nosnippet>352</a> <span class="kw">let </span>generic_params = db.generic_params(func.into()); |
| <a href=#353 id=353 data-nosnippet>353</a> <span class="kw">if </span>generic_params.len_type_or_consts() > <span class="number">0 </span>{ |
| <a href=#354 id=354 data-nosnippet>354</a> cb(MethodViolationCode::Generic)<span class="question-mark">?</span>; |
| <a href=#355 id=355 data-nosnippet>355</a> } |
| <a href=#356 id=356 data-nosnippet>356</a> |
| <a href=#357 id=357 data-nosnippet>357</a> <span class="kw">if </span>func_data.has_self_param() && !receiver_is_dispatchable(db, trait_, func, <span class="kw-2">&</span>sig) { |
| <a href=#358 id=358 data-nosnippet>358</a> cb(MethodViolationCode::UndispatchableReceiver)<span class="question-mark">?</span>; |
| <a href=#359 id=359 data-nosnippet>359</a> } |
| <a href=#360 id=360 data-nosnippet>360</a> |
| <a href=#361 id=361 data-nosnippet>361</a> <span class="kw">let </span>predicates = GenericPredicates::query_own(db, func.into()); |
| <a href=#362 id=362 data-nosnippet>362</a> <span class="kw">for </span>pred <span class="kw">in </span>predicates.iter_identity_copied() { |
| <a href=#363 id=363 data-nosnippet>363</a> <span class="kw">let </span>pred = pred.kind().skip_binder(); |
| <a href=#364 id=364 data-nosnippet>364</a> |
| <a href=#365 id=365 data-nosnippet>365</a> <span class="kw">if </span><span class="macro">matches!</span>(pred, ClauseKind::TypeOutlives(<span class="kw">_</span>)) { |
| <a href=#366 id=366 data-nosnippet>366</a> <span class="kw">continue</span>; |
| <a href=#367 id=367 data-nosnippet>367</a> } |
| <a href=#368 id=368 data-nosnippet>368</a> |
| <a href=#369 id=369 data-nosnippet>369</a> <span class="comment">// Allow `impl AutoTrait` predicates |
| <a href=#370 id=370 data-nosnippet>370</a> </span><span class="kw">if let </span>ClauseKind::Trait(TraitPredicate { |
| <a href=#371 id=371 data-nosnippet>371</a> trait_ref: pred_trait_ref, |
| <a href=#372 id=372 data-nosnippet>372</a> polarity: PredicatePolarity::Positive, |
| <a href=#373 id=373 data-nosnippet>373</a> }) = pred |
| <a href=#374 id=374 data-nosnippet>374</a> && <span class="kw">let </span>trait_data = db.trait_signature(pred_trait_ref.def_id.<span class="number">0</span>) |
| <a href=#375 id=375 data-nosnippet>375</a> && trait_data.flags.contains(TraitFlags::AUTO) |
| <a href=#376 id=376 data-nosnippet>376</a> && <span class="kw">let </span>rustc_type_ir::TyKind::Param(ParamTy { index: <span class="number">0</span>, .. }) = |
| <a href=#377 id=377 data-nosnippet>377</a> pred_trait_ref.self_ty().kind() |
| <a href=#378 id=378 data-nosnippet>378</a> { |
| <a href=#379 id=379 data-nosnippet>379</a> <span class="kw">continue</span>; |
| <a href=#380 id=380 data-nosnippet>380</a> } |
| <a href=#381 id=381 data-nosnippet>381</a> |
| <a href=#382 id=382 data-nosnippet>382</a> <span class="kw">if </span>contains_illegal_self_type_reference(db, trait_, <span class="kw-2">&</span>pred, AllowSelfProjection::Yes) { |
| <a href=#383 id=383 data-nosnippet>383</a> cb(MethodViolationCode::WhereClauseReferencesSelf)<span class="question-mark">?</span>; |
| <a href=#384 id=384 data-nosnippet>384</a> <span class="kw">break</span>; |
| <a href=#385 id=385 data-nosnippet>385</a> } |
| <a href=#386 id=386 data-nosnippet>386</a> } |
| <a href=#387 id=387 data-nosnippet>387</a> |
| <a href=#388 id=388 data-nosnippet>388</a> ControlFlow::Continue(()) |
| <a href=#389 id=389 data-nosnippet>389</a>} |
| <a href=#390 id=390 data-nosnippet>390</a> |
| <a href=#391 id=391 data-nosnippet>391</a><span class="kw">fn </span>receiver_is_dispatchable<<span class="lifetime">'db</span>>( |
| <a href=#392 id=392 data-nosnippet>392</a> db: <span class="kw-2">&</span><span class="kw">dyn </span>HirDatabase, |
| <a href=#393 id=393 data-nosnippet>393</a> trait_: TraitId, |
| <a href=#394 id=394 data-nosnippet>394</a> func: FunctionId, |
| <a href=#395 id=395 data-nosnippet>395</a> sig: <span class="kw-2">&</span>EarlyBinder<<span class="lifetime">'db</span>, Binder<<span class="lifetime">'db</span>, rustc_type_ir::FnSig<DbInterner<<span class="lifetime">'db</span>>>>>, |
| <a href=#396 id=396 data-nosnippet>396</a>) -> bool { |
| <a href=#397 id=397 data-nosnippet>397</a> <span class="kw">let </span>sig = sig.instantiate_identity(); |
| <a href=#398 id=398 data-nosnippet>398</a> |
| <a href=#399 id=399 data-nosnippet>399</a> <span class="kw">let </span>module = trait_.module(db); |
| <a href=#400 id=400 data-nosnippet>400</a> <span class="kw">let </span>interner = DbInterner::new_with(db, module.krate(db)); |
| <a href=#401 id=401 data-nosnippet>401</a> <span class="kw">let </span>self_param_id = TypeParamId::from_unchecked(TypeOrConstParamId { |
| <a href=#402 id=402 data-nosnippet>402</a> parent: trait_.into(), |
| <a href=#403 id=403 data-nosnippet>403</a> local_id: LocalTypeOrConstParamId::from_raw(la_arena::RawIdx::from_u32(<span class="number">0</span>)), |
| <a href=#404 id=404 data-nosnippet>404</a> }); |
| <a href=#405 id=405 data-nosnippet>405</a> <span class="kw">let </span>self_param_ty = |
| <a href=#406 id=406 data-nosnippet>406</a> Ty::new(interner, rustc_type_ir::TyKind::Param(ParamTy { index: <span class="number">0</span>, id: self_param_id })); |
| <a href=#407 id=407 data-nosnippet>407</a> |
| <a href=#408 id=408 data-nosnippet>408</a> <span class="comment">// `self: Self` can't be dispatched on, but this is already considered dyn-compatible |
| <a href=#409 id=409 data-nosnippet>409</a> // See rustc's comment on https://github.com/rust-lang/rust/blob/3f121b9461cce02a703a0e7e450568849dfaa074/compiler/rustc_trait_selection/src/traits/object_safety.rs#L433-L437 |
| <a href=#410 id=410 data-nosnippet>410</a> </span><span class="kw">if </span>sig.inputs().iter().next().is_some_and(|p| <span class="kw-2">*</span>p.skip_binder() == self_param_ty) { |
| <a href=#411 id=411 data-nosnippet>411</a> <span class="kw">return </span><span class="bool-val">true</span>; |
| <a href=#412 id=412 data-nosnippet>412</a> } |
| <a href=#413 id=413 data-nosnippet>413</a> |
| <a href=#414 id=414 data-nosnippet>414</a> <span class="kw">let </span><span class="prelude-val">Some</span>(<span class="kw-2">&</span>receiver_ty) = sig.inputs().skip_binder().first() <span class="kw">else </span>{ |
| <a href=#415 id=415 data-nosnippet>415</a> <span class="kw">return </span><span class="bool-val">false</span>; |
| <a href=#416 id=416 data-nosnippet>416</a> }; |
| <a href=#417 id=417 data-nosnippet>417</a> |
| <a href=#418 id=418 data-nosnippet>418</a> <span class="kw">let </span>lang_items = interner.lang_items(); |
| <a href=#419 id=419 data-nosnippet>419</a> <span class="kw">let </span>traits = (lang_items.Unsize, lang_items.DispatchFromDyn); |
| <a href=#420 id=420 data-nosnippet>420</a> <span class="kw">let </span>(<span class="prelude-val">Some</span>(unsize_did), <span class="prelude-val">Some</span>(dispatch_from_dyn_did)) = traits <span class="kw">else </span>{ |
| <a href=#421 id=421 data-nosnippet>421</a> <span class="kw">return </span><span class="bool-val">false</span>; |
| <a href=#422 id=422 data-nosnippet>422</a> }; |
| <a href=#423 id=423 data-nosnippet>423</a> |
| <a href=#424 id=424 data-nosnippet>424</a> <span class="kw">let </span>meta_sized_did = lang_items.MetaSized; |
| <a href=#425 id=425 data-nosnippet>425</a> |
| <a href=#426 id=426 data-nosnippet>426</a> <span class="comment">// TODO: This is for supporting dyn compatibility for toolchains doesn't contain `MetaSized` |
| <a href=#427 id=427 data-nosnippet>427</a> // trait. Uncomment and short circuit here once `MINIMUM_SUPPORTED_TOOLCHAIN_VERSION` |
| <a href=#428 id=428 data-nosnippet>428</a> // become > 1.88.0 |
| <a href=#429 id=429 data-nosnippet>429</a> // |
| <a href=#430 id=430 data-nosnippet>430</a> // let Some(meta_sized_did) = meta_sized_did else { |
| <a href=#431 id=431 data-nosnippet>431</a> // return false; |
| <a href=#432 id=432 data-nosnippet>432</a> // }; |
| <a href=#433 id=433 data-nosnippet>433</a> |
| <a href=#434 id=434 data-nosnippet>434</a> // Type `U` |
| <a href=#435 id=435 data-nosnippet>435</a> // FIXME: That seems problematic to fake a generic param like that? |
| <a href=#436 id=436 data-nosnippet>436</a> </span><span class="kw">let </span>unsized_self_ty = Ty::new_param(interner, self_param_id, u32::MAX); |
| <a href=#437 id=437 data-nosnippet>437</a> <span class="comment">// `Receiver[Self => U]` |
| <a href=#438 id=438 data-nosnippet>438</a> </span><span class="kw">let </span>unsized_receiver_ty = receiver_for_self_ty(interner, func, receiver_ty, unsized_self_ty); |
| <a href=#439 id=439 data-nosnippet>439</a> |
| <a href=#440 id=440 data-nosnippet>440</a> <span class="kw">let </span>param_env = { |
| <a href=#441 id=441 data-nosnippet>441</a> <span class="kw">let </span>generic_predicates = GenericPredicates::query_all(db, func.into()); |
| <a href=#442 id=442 data-nosnippet>442</a> |
| <a href=#443 id=443 data-nosnippet>443</a> <span class="comment">// Self: Unsize<U> |
| <a href=#444 id=444 data-nosnippet>444</a> </span><span class="kw">let </span>unsize_predicate = |
| <a href=#445 id=445 data-nosnippet>445</a> TraitRef::new(interner, unsize_did.into(), [self_param_ty, unsized_self_ty]); |
| <a href=#446 id=446 data-nosnippet>446</a> |
| <a href=#447 id=447 data-nosnippet>447</a> <span class="comment">// U: Trait<Arg1, ..., ArgN> |
| <a href=#448 id=448 data-nosnippet>448</a> </span><span class="kw">let </span>args = GenericArgs::for_item(interner, trait_.into(), |index, kind, <span class="kw">_</span>| { |
| <a href=#449 id=449 data-nosnippet>449</a> <span class="kw">if </span>index == <span class="number">0 </span>{ unsized_self_ty.into() } <span class="kw">else </span>{ mk_param(interner, index, kind) } |
| <a href=#450 id=450 data-nosnippet>450</a> }); |
| <a href=#451 id=451 data-nosnippet>451</a> <span class="kw">let </span>trait_predicate = TraitRef::new_from_args(interner, trait_.into(), args); |
| <a href=#452 id=452 data-nosnippet>452</a> |
| <a href=#453 id=453 data-nosnippet>453</a> <span class="kw">let </span>meta_sized_predicate = meta_sized_did |
| <a href=#454 id=454 data-nosnippet>454</a> .map(|did| TraitRef::new(interner, did.into(), [unsized_self_ty]).upcast(interner)); |
| <a href=#455 id=455 data-nosnippet>455</a> |
| <a href=#456 id=456 data-nosnippet>456</a> ParamEnv { |
| <a href=#457 id=457 data-nosnippet>457</a> clauses: Clauses::new_from_iter( |
| <a href=#458 id=458 data-nosnippet>458</a> interner, |
| <a href=#459 id=459 data-nosnippet>459</a> generic_predicates |
| <a href=#460 id=460 data-nosnippet>460</a> .iter_identity_copied() |
| <a href=#461 id=461 data-nosnippet>461</a> .chain([unsize_predicate.upcast(interner), trait_predicate.upcast(interner)]) |
| <a href=#462 id=462 data-nosnippet>462</a> .chain(meta_sized_predicate), |
| <a href=#463 id=463 data-nosnippet>463</a> ), |
| <a href=#464 id=464 data-nosnippet>464</a> } |
| <a href=#465 id=465 data-nosnippet>465</a> }; |
| <a href=#466 id=466 data-nosnippet>466</a> |
| <a href=#467 id=467 data-nosnippet>467</a> <span class="comment">// Receiver: DispatchFromDyn<Receiver[Self => U]> |
| <a href=#468 id=468 data-nosnippet>468</a> </span><span class="kw">let </span>predicate = |
| <a href=#469 id=469 data-nosnippet>469</a> TraitRef::new(interner, dispatch_from_dyn_did.into(), [receiver_ty, unsized_receiver_ty]); |
| <a href=#470 id=470 data-nosnippet>470</a> <span class="kw">let </span>goal = Goal::new(interner, param_env, predicate); |
| <a href=#471 id=471 data-nosnippet>471</a> |
| <a href=#472 id=472 data-nosnippet>472</a> <span class="kw">let </span>infcx = interner.infer_ctxt().build(TypingMode::non_body_analysis()); |
| <a href=#473 id=473 data-nosnippet>473</a> <span class="comment">// the receiver is dispatchable iff the obligation holds |
| <a href=#474 id=474 data-nosnippet>474</a> </span><span class="kw">let </span>res = next_trait_solve_in_ctxt(<span class="kw-2">&</span>infcx, goal); |
| <a href=#475 id=475 data-nosnippet>475</a> res.map_or(<span class="bool-val">false</span>, |res| <span class="macro">matches!</span>(res.<span class="number">1</span>, rustc_type_ir::solve::Certainty::Yes)) |
| <a href=#476 id=476 data-nosnippet>476</a>} |
| <a href=#477 id=477 data-nosnippet>477</a> |
| <a href=#478 id=478 data-nosnippet>478</a><span class="kw">fn </span>receiver_for_self_ty<<span class="lifetime">'db</span>>( |
| <a href=#479 id=479 data-nosnippet>479</a> interner: DbInterner<<span class="lifetime">'db</span>>, |
| <a href=#480 id=480 data-nosnippet>480</a> func: FunctionId, |
| <a href=#481 id=481 data-nosnippet>481</a> receiver_ty: Ty<<span class="lifetime">'db</span>>, |
| <a href=#482 id=482 data-nosnippet>482</a> self_ty: Ty<<span class="lifetime">'db</span>>, |
| <a href=#483 id=483 data-nosnippet>483</a>) -> Ty<<span class="lifetime">'db</span>> { |
| <a href=#484 id=484 data-nosnippet>484</a> <span class="kw">let </span>args = GenericArgs::for_item(interner, SolverDefId::FunctionId(func), |index, kind, <span class="kw">_</span>| { |
| <a href=#485 id=485 data-nosnippet>485</a> <span class="kw">if </span>index == <span class="number">0 </span>{ self_ty.into() } <span class="kw">else </span>{ mk_param(interner, index, kind) } |
| <a href=#486 id=486 data-nosnippet>486</a> }); |
| <a href=#487 id=487 data-nosnippet>487</a> |
| <a href=#488 id=488 data-nosnippet>488</a> EarlyBinder::bind(receiver_ty).instantiate(interner, args) |
| <a href=#489 id=489 data-nosnippet>489</a>} |
| <a href=#490 id=490 data-nosnippet>490</a> |
| <a href=#491 id=491 data-nosnippet>491</a><span class="kw">fn </span>contains_illegal_impl_trait_in_trait<<span class="lifetime">'db</span>>( |
| <a href=#492 id=492 data-nosnippet>492</a> db: <span class="kw-2">&</span><span class="lifetime">'db </span><span class="kw">dyn </span>HirDatabase, |
| <a href=#493 id=493 data-nosnippet>493</a> sig: <span class="kw-2">&</span>EarlyBinder<<span class="lifetime">'db</span>, Binder<<span class="lifetime">'db</span>, rustc_type_ir::FnSig<DbInterner<<span class="lifetime">'db</span>>>>>, |
| <a href=#494 id=494 data-nosnippet>494</a>) -> <span class="prelude-ty">Option</span><MethodViolationCode> { |
| <a href=#495 id=495 data-nosnippet>495</a> <span class="kw">struct </span>OpaqueTypeCollector(FxHashSet<InternedOpaqueTyId>); |
| <a href=#496 id=496 data-nosnippet>496</a> |
| <a href=#497 id=497 data-nosnippet>497</a> <span class="kw">impl</span><<span class="lifetime">'db</span>> rustc_type_ir::TypeVisitor<DbInterner<<span class="lifetime">'db</span>>> <span class="kw">for </span>OpaqueTypeCollector { |
| <a href=#498 id=498 data-nosnippet>498</a> <span class="kw">type </span><span class="prelude-ty">Result </span>= ControlFlow<()>; |
| <a href=#499 id=499 data-nosnippet>499</a> |
| <a href=#500 id=500 data-nosnippet>500</a> <span class="kw">fn </span>visit_ty( |
| <a href=#501 id=501 data-nosnippet>501</a> <span class="kw-2">&mut </span><span class="self">self</span>, |
| <a href=#502 id=502 data-nosnippet>502</a> ty: <DbInterner<<span class="lifetime">'db</span>> <span class="kw">as </span>rustc_type_ir::Interner>::Ty, |
| <a href=#503 id=503 data-nosnippet>503</a> ) -> <span class="self">Self</span>::Result { |
| <a href=#504 id=504 data-nosnippet>504</a> <span class="kw">if let </span>rustc_type_ir::TyKind::Alias(AliasTyKind::Opaque, op) = ty.kind() { |
| <a href=#505 id=505 data-nosnippet>505</a> <span class="kw">let </span>id = <span class="kw">match </span>op.def_id { |
| <a href=#506 id=506 data-nosnippet>506</a> SolverDefId::InternedOpaqueTyId(id) => id, |
| <a href=#507 id=507 data-nosnippet>507</a> <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(), |
| <a href=#508 id=508 data-nosnippet>508</a> }; |
| <a href=#509 id=509 data-nosnippet>509</a> <span class="self">self</span>.<span class="number">0</span>.insert(id); |
| <a href=#510 id=510 data-nosnippet>510</a> } |
| <a href=#511 id=511 data-nosnippet>511</a> ty.super_visit_with(<span class="self">self</span>) |
| <a href=#512 id=512 data-nosnippet>512</a> } |
| <a href=#513 id=513 data-nosnippet>513</a> } |
| <a href=#514 id=514 data-nosnippet>514</a> |
| <a href=#515 id=515 data-nosnippet>515</a> <span class="kw">let </span>ret = sig.skip_binder().output(); |
| <a href=#516 id=516 data-nosnippet>516</a> <span class="kw">let </span><span class="kw-2">mut </span>visitor = OpaqueTypeCollector(FxHashSet::default()); |
| <a href=#517 id=517 data-nosnippet>517</a> <span class="kw">_ </span>= ret.visit_with(<span class="kw-2">&mut </span>visitor); |
| <a href=#518 id=518 data-nosnippet>518</a> |
| <a href=#519 id=519 data-nosnippet>519</a> <span class="comment">// Since we haven't implemented RPITIT in proper way like rustc yet, |
| <a href=#520 id=520 data-nosnippet>520</a> // just check whether `ret` contains RPIT for now |
| <a href=#521 id=521 data-nosnippet>521</a> </span><span class="kw">for </span>opaque_ty <span class="kw">in </span>visitor.<span class="number">0 </span>{ |
| <a href=#522 id=522 data-nosnippet>522</a> <span class="kw">let </span>impl_trait_id = db.lookup_intern_impl_trait_id(opaque_ty); |
| <a href=#523 id=523 data-nosnippet>523</a> <span class="kw">if </span><span class="macro">matches!</span>(impl_trait_id, ImplTraitId::ReturnTypeImplTrait(..)) { |
| <a href=#524 id=524 data-nosnippet>524</a> <span class="kw">return </span><span class="prelude-val">Some</span>(MethodViolationCode::ReferencesImplTraitInTrait); |
| <a href=#525 id=525 data-nosnippet>525</a> } |
| <a href=#526 id=526 data-nosnippet>526</a> } |
| <a href=#527 id=527 data-nosnippet>527</a> |
| <a href=#528 id=528 data-nosnippet>528</a> <span class="prelude-val">None |
| <a href=#529 id=529 data-nosnippet>529</a></span>} |
| <a href=#530 id=530 data-nosnippet>530</a> |
| <a href=#531 id=531 data-nosnippet>531</a><span class="attr">#[cfg(test)] |
| <a href=#532 id=532 data-nosnippet>532</a></span><span class="kw">mod </span>tests; |
| </code></pre></div></section></main></body></html> |
