| <!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/method_resolution/confirm.rs`."><title>confirm.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-b7b9f40b.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="1.95.0 (59807616e 2026-04-14)" data-channel="1.95.0" data-search-js="search-63369b7b.js" data-stringdex-js="stringdex-b897f86f.js" data-settings-js="settings-170eb4bf.js" ><script src="../../../static.files/storage-41dd4d93.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-5013f961.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-f7c3ffd8.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"><a class="skip-main-content" href="#main-content">Skip to main content</a><!--[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" tabindex="-1"><div class="main-heading"><h1><div class="sub-heading">hir_ty/method_resolution/</div>confirm.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">//! Confirmation step of method selection, meaning ensuring the selected candidate |
| <a href=#2 id=2 data-nosnippet>2</a>//! is valid and registering all obligations. |
| <a href=#3 id=3 data-nosnippet>3</a> |
| <a href=#4 id=4 data-nosnippet>4</a></span><span class="kw">use </span>hir_def::{ |
| <a href=#5 id=5 data-nosnippet>5</a> FunctionId, GenericDefId, GenericParamId, ItemContainerId, TraitId, |
| <a href=#6 id=6 data-nosnippet>6</a> expr_store::path::{GenericArg <span class="kw">as </span>HirGenericArg, GenericArgs <span class="kw">as </span>HirGenericArgs}, |
| <a href=#7 id=7 data-nosnippet>7</a> hir::{ExprId, generics::GenericParamDataRef}, |
| <a href=#8 id=8 data-nosnippet>8</a>}; |
| <a href=#9 id=9 data-nosnippet>9</a><span class="kw">use </span>rustc_type_ir::{ |
| <a href=#10 id=10 data-nosnippet>10</a> TypeFoldable, |
| <a href=#11 id=11 data-nosnippet>11</a> elaborate::elaborate, |
| <a href=#12 id=12 data-nosnippet>12</a> inherent::{BoundExistentialPredicates, IntoKind, Ty <span class="kw">as _</span>}, |
| <a href=#13 id=13 data-nosnippet>13</a>}; |
| <a href=#14 id=14 data-nosnippet>14</a><span class="kw">use </span>tracing::debug; |
| <a href=#15 id=15 data-nosnippet>15</a> |
| <a href=#16 id=16 data-nosnippet>16</a><span class="kw">use </span>crate::{ |
| <a href=#17 id=17 data-nosnippet>17</a> Adjust, Adjustment, AutoBorrow, IncorrectGenericsLenKind, InferenceDiagnostic, |
| <a href=#18 id=18 data-nosnippet>18</a> LifetimeElisionKind, PointerCast, |
| <a href=#19 id=19 data-nosnippet>19</a> db::HirDatabase, |
| <a href=#20 id=20 data-nosnippet>20</a> infer::{AllowTwoPhase, AutoBorrowMutability, InferenceContext, TypeMismatch}, |
| <a href=#21 id=21 data-nosnippet>21</a> lower::{ |
| <a href=#22 id=22 data-nosnippet>22</a> GenericPredicates, |
| <a href=#23 id=23 data-nosnippet>23</a> path::{GenericArgsLowerer, TypeLikeConst, substs_from_args_and_bindings}, |
| <a href=#24 id=24 data-nosnippet>24</a> }, |
| <a href=#25 id=25 data-nosnippet>25</a> method_resolution::{CandidateId, MethodCallee, probe}, |
| <a href=#26 id=26 data-nosnippet>26</a> next_solver::{ |
| <a href=#27 id=27 data-nosnippet>27</a> Binder, Clause, ClauseKind, Const, DbInterner, EarlyParamRegion, ErrorGuaranteed, FnSig, |
| <a href=#28 id=28 data-nosnippet>28</a> GenericArg, GenericArgs, ParamConst, PolyExistentialTraitRef, PolyTraitRef, Region, |
| <a href=#29 id=29 data-nosnippet>29</a> TraitRef, Ty, TyKind, |
| <a href=#30 id=30 data-nosnippet>30</a> infer::{ |
| <a href=#31 id=31 data-nosnippet>31</a> BoundRegionConversionTime, InferCtxt, |
| <a href=#32 id=32 data-nosnippet>32</a> traits::{ObligationCause, PredicateObligation}, |
| <a href=#33 id=33 data-nosnippet>33</a> }, |
| <a href=#34 id=34 data-nosnippet>34</a> util::{clauses_as_obligations, upcast_choices}, |
| <a href=#35 id=35 data-nosnippet>35</a> }, |
| <a href=#36 id=36 data-nosnippet>36</a>}; |
| <a href=#37 id=37 data-nosnippet>37</a> |
| <a href=#38 id=38 data-nosnippet>38</a><span class="kw">struct </span>ConfirmContext<<span class="lifetime">'a</span>, <span class="lifetime">'b</span>, <span class="lifetime">'db</span>> { |
| <a href=#39 id=39 data-nosnippet>39</a> ctx: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>InferenceContext<<span class="lifetime">'b</span>, <span class="lifetime">'db</span>>, |
| <a href=#40 id=40 data-nosnippet>40</a> candidate: FunctionId, |
| <a href=#41 id=41 data-nosnippet>41</a> expr: ExprId, |
| <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="attr">#[derive(Debug)] |
| <a href=#45 id=45 data-nosnippet>45</a></span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>ConfirmResult<<span class="lifetime">'db</span>> { |
| <a href=#46 id=46 data-nosnippet>46</a> <span class="kw">pub</span>(<span class="kw">crate</span>) callee: MethodCallee<<span class="lifetime">'db</span>>, |
| <a href=#47 id=47 data-nosnippet>47</a> <span class="kw">pub</span>(<span class="kw">crate</span>) illegal_sized_bound: bool, |
| <a href=#48 id=48 data-nosnippet>48</a> <span class="kw">pub</span>(<span class="kw">crate</span>) adjustments: Box<[Adjustment]>, |
| <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">impl</span><<span class="lifetime">'a</span>, <span class="lifetime">'db</span>> InferenceContext<<span class="lifetime">'a</span>, <span class="lifetime">'db</span>> { |
| <a href=#52 id=52 data-nosnippet>52</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>confirm_method( |
| <a href=#53 id=53 data-nosnippet>53</a> <span class="kw-2">&mut </span><span class="self">self</span>, |
| <a href=#54 id=54 data-nosnippet>54</a> pick: <span class="kw-2">&</span>probe::Pick<<span class="lifetime">'db</span>>, |
| <a href=#55 id=55 data-nosnippet>55</a> unadjusted_self_ty: Ty<<span class="lifetime">'db</span>>, |
| <a href=#56 id=56 data-nosnippet>56</a> expr: ExprId, |
| <a href=#57 id=57 data-nosnippet>57</a> generic_args: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>HirGenericArgs>, |
| <a href=#58 id=58 data-nosnippet>58</a> ) -> ConfirmResult<<span class="lifetime">'db</span>> { |
| <a href=#59 id=59 data-nosnippet>59</a> <span class="macro">debug!</span>( |
| <a href=#60 id=60 data-nosnippet>60</a> <span class="string">"confirm(unadjusted_self_ty={:?}, pick={:?}, generic_args={:?})"</span>, |
| <a href=#61 id=61 data-nosnippet>61</a> unadjusted_self_ty, pick, generic_args, |
| <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> <span class="kw">let </span>CandidateId::FunctionId(candidate) = pick.item <span class="kw">else </span>{ |
| <a href=#65 id=65 data-nosnippet>65</a> <span class="macro">panic!</span>(<span class="string">"confirmation is only done for method calls, not path lookups"</span>); |
| <a href=#66 id=66 data-nosnippet>66</a> }; |
| <a href=#67 id=67 data-nosnippet>67</a> <span class="kw">let </span><span class="kw-2">mut </span>confirm_cx = ConfirmContext::new(<span class="self">self</span>, candidate, expr); |
| <a href=#68 id=68 data-nosnippet>68</a> confirm_cx.confirm(unadjusted_self_ty, pick, generic_args) |
| <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><<span class="lifetime">'a</span>, <span class="lifetime">'b</span>, <span class="lifetime">'db</span>> ConfirmContext<<span class="lifetime">'a</span>, <span class="lifetime">'b</span>, <span class="lifetime">'db</span>> { |
| <a href=#73 id=73 data-nosnippet>73</a> <span class="kw">fn </span>new( |
| <a href=#74 id=74 data-nosnippet>74</a> ctx: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>InferenceContext<<span class="lifetime">'b</span>, <span class="lifetime">'db</span>>, |
| <a href=#75 id=75 data-nosnippet>75</a> candidate: FunctionId, |
| <a href=#76 id=76 data-nosnippet>76</a> expr: ExprId, |
| <a href=#77 id=77 data-nosnippet>77</a> ) -> ConfirmContext<<span class="lifetime">'a</span>, <span class="lifetime">'b</span>, <span class="lifetime">'db</span>> { |
| <a href=#78 id=78 data-nosnippet>78</a> ConfirmContext { ctx, candidate, expr } |
| <a href=#79 id=79 data-nosnippet>79</a> } |
| <a href=#80 id=80 data-nosnippet>80</a> |
| <a href=#81 id=81 data-nosnippet>81</a> <span class="attr">#[inline] |
| <a href=#82 id=82 data-nosnippet>82</a> </span><span class="kw">fn </span>db(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="lifetime">'db </span><span class="kw">dyn </span>HirDatabase { |
| <a href=#83 id=83 data-nosnippet>83</a> <span class="self">self</span>.ctx.table.infer_ctxt.interner.db |
| <a href=#84 id=84 data-nosnippet>84</a> } |
| <a href=#85 id=85 data-nosnippet>85</a> |
| <a href=#86 id=86 data-nosnippet>86</a> <span class="attr">#[inline] |
| <a href=#87 id=87 data-nosnippet>87</a> </span><span class="kw">fn </span>interner(<span class="kw-2">&</span><span class="self">self</span>) -> DbInterner<<span class="lifetime">'db</span>> { |
| <a href=#88 id=88 data-nosnippet>88</a> <span class="self">self</span>.ctx.table.infer_ctxt.interner |
| <a href=#89 id=89 data-nosnippet>89</a> } |
| <a href=#90 id=90 data-nosnippet>90</a> |
| <a href=#91 id=91 data-nosnippet>91</a> <span class="attr">#[inline] |
| <a href=#92 id=92 data-nosnippet>92</a> </span><span class="kw">fn </span>infcx(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>InferCtxt<<span class="lifetime">'db</span>> { |
| <a href=#93 id=93 data-nosnippet>93</a> <span class="kw-2">&</span><span class="self">self</span>.ctx.table.infer_ctxt |
| <a href=#94 id=94 data-nosnippet>94</a> } |
| <a href=#95 id=95 data-nosnippet>95</a> |
| <a href=#96 id=96 data-nosnippet>96</a> <span class="kw">fn </span>confirm( |
| <a href=#97 id=97 data-nosnippet>97</a> <span class="kw-2">&mut </span><span class="self">self</span>, |
| <a href=#98 id=98 data-nosnippet>98</a> unadjusted_self_ty: Ty<<span class="lifetime">'db</span>>, |
| <a href=#99 id=99 data-nosnippet>99</a> pick: <span class="kw-2">&</span>probe::Pick<<span class="lifetime">'db</span>>, |
| <a href=#100 id=100 data-nosnippet>100</a> generic_args: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>HirGenericArgs>, |
| <a href=#101 id=101 data-nosnippet>101</a> ) -> ConfirmResult<<span class="lifetime">'db</span>> { |
| <a href=#102 id=102 data-nosnippet>102</a> <span class="comment">// Adjust the self expression the user provided and obtain the adjusted type. |
| <a href=#103 id=103 data-nosnippet>103</a> </span><span class="kw">let </span>(self_ty, adjustments) = <span class="self">self</span>.adjust_self_ty(unadjusted_self_ty, pick); |
| <a href=#104 id=104 data-nosnippet>104</a> |
| <a href=#105 id=105 data-nosnippet>105</a> <span class="comment">// Create generic args for the method's type parameters. |
| <a href=#106 id=106 data-nosnippet>106</a> </span><span class="kw">let </span>rcvr_args = <span class="self">self</span>.fresh_receiver_args(self_ty, pick); |
| <a href=#107 id=107 data-nosnippet>107</a> <span class="kw">let </span>all_args = <span class="self">self</span>.instantiate_method_args(generic_args, rcvr_args); |
| <a href=#108 id=108 data-nosnippet>108</a> |
| <a href=#109 id=109 data-nosnippet>109</a> <span class="macro">debug!</span>(<span class="string">"rcvr_args={rcvr_args:?}, all_args={all_args:?}"</span>); |
| <a href=#110 id=110 data-nosnippet>110</a> |
| <a href=#111 id=111 data-nosnippet>111</a> <span class="comment">// Create the final signature for the method, replacing late-bound regions. |
| <a href=#112 id=112 data-nosnippet>112</a> </span><span class="kw">let </span>(method_sig, method_predicates) = |
| <a href=#113 id=113 data-nosnippet>113</a> <span class="self">self</span>.instantiate_method_sig(pick, all_args.as_slice()); |
| <a href=#114 id=114 data-nosnippet>114</a> |
| <a href=#115 id=115 data-nosnippet>115</a> <span class="comment">// If there is a `Self: Sized` bound and `Self` is a trait object, it is possible that |
| <a href=#116 id=116 data-nosnippet>116</a> // something which derefs to `Self` actually implements the trait and the caller |
| <a href=#117 id=117 data-nosnippet>117</a> // wanted to make a static dispatch on it but forgot to import the trait. |
| <a href=#118 id=118 data-nosnippet>118</a> // See test `tests/ui/issues/issue-35976.rs`. |
| <a href=#119 id=119 data-nosnippet>119</a> // |
| <a href=#120 id=120 data-nosnippet>120</a> // In that case, we'll error anyway, but we'll also re-run the search with all traits |
| <a href=#121 id=121 data-nosnippet>121</a> // in scope, and if we find another method which can be used, we'll output an |
| <a href=#122 id=122 data-nosnippet>122</a> // appropriate hint suggesting to import the trait. |
| <a href=#123 id=123 data-nosnippet>123</a> </span><span class="kw">let </span>filler_args = GenericArgs::fill_rest( |
| <a href=#124 id=124 data-nosnippet>124</a> <span class="self">self</span>.interner(), |
| <a href=#125 id=125 data-nosnippet>125</a> <span class="self">self</span>.candidate.into(), |
| <a href=#126 id=126 data-nosnippet>126</a> rcvr_args, |
| <a href=#127 id=127 data-nosnippet>127</a> |index, id, <span class="kw">_</span>| <span class="kw">match </span>id { |
| <a href=#128 id=128 data-nosnippet>128</a> GenericParamId::TypeParamId(id) => Ty::new_param(<span class="self">self</span>.interner(), id, index).into(), |
| <a href=#129 id=129 data-nosnippet>129</a> GenericParamId::ConstParamId(id) => { |
| <a href=#130 id=130 data-nosnippet>130</a> Const::new_param(<span class="self">self</span>.interner(), ParamConst { id, index }).into() |
| <a href=#131 id=131 data-nosnippet>131</a> } |
| <a href=#132 id=132 data-nosnippet>132</a> GenericParamId::LifetimeParamId(id) => { |
| <a href=#133 id=133 data-nosnippet>133</a> Region::new_early_param(<span class="self">self</span>.interner(), EarlyParamRegion { id, index }).into() |
| <a href=#134 id=134 data-nosnippet>134</a> } |
| <a href=#135 id=135 data-nosnippet>135</a> }, |
| <a href=#136 id=136 data-nosnippet>136</a> ); |
| <a href=#137 id=137 data-nosnippet>137</a> <span class="kw">let </span>illegal_sized_bound = <span class="self">self</span>.predicates_require_illegal_sized_bound( |
| <a href=#138 id=138 data-nosnippet>138</a> GenericPredicates::query_all(<span class="self">self</span>.db(), <span class="self">self</span>.candidate.into()) |
| <a href=#139 id=139 data-nosnippet>139</a> .iter_instantiated(<span class="self">self</span>.interner(), filler_args.as_slice()), |
| <a href=#140 id=140 data-nosnippet>140</a> ); |
| <a href=#141 id=141 data-nosnippet>141</a> |
| <a href=#142 id=142 data-nosnippet>142</a> <span class="comment">// Unify the (adjusted) self type with what the method expects. |
| <a href=#143 id=143 data-nosnippet>143</a> // |
| <a href=#144 id=144 data-nosnippet>144</a> // SUBTLE: if we want good error messages, because of "guessing" while matching |
| <a href=#145 id=145 data-nosnippet>145</a> // traits, no trait system method can be called before this point because they |
| <a href=#146 id=146 data-nosnippet>146</a> // could alter our Self-type, except for normalizing the receiver from the |
| <a href=#147 id=147 data-nosnippet>147</a> // signature (which is also done during probing). |
| <a href=#148 id=148 data-nosnippet>148</a> </span><span class="kw">let </span>method_sig_rcvr = method_sig.inputs()[<span class="number">0</span>]; |
| <a href=#149 id=149 data-nosnippet>149</a> <span class="macro">debug!</span>( |
| <a href=#150 id=150 data-nosnippet>150</a> <span class="string">"confirm: self_ty={:?} method_sig_rcvr={:?} method_sig={:?}"</span>, |
| <a href=#151 id=151 data-nosnippet>151</a> self_ty, method_sig_rcvr, method_sig |
| <a href=#152 id=152 data-nosnippet>152</a> ); |
| <a href=#153 id=153 data-nosnippet>153</a> <span class="self">self</span>.unify_receivers(self_ty, method_sig_rcvr, pick); |
| <a href=#154 id=154 data-nosnippet>154</a> |
| <a href=#155 id=155 data-nosnippet>155</a> <span class="comment">// Make sure nobody calls `drop()` explicitly. |
| <a href=#156 id=156 data-nosnippet>156</a> </span><span class="self">self</span>.check_for_illegal_method_calls(); |
| <a href=#157 id=157 data-nosnippet>157</a> |
| <a href=#158 id=158 data-nosnippet>158</a> <span class="comment">// Lint when an item is shadowing a supertrait item. |
| <a href=#159 id=159 data-nosnippet>159</a> </span><span class="self">self</span>.lint_shadowed_supertrait_items(pick); |
| <a href=#160 id=160 data-nosnippet>160</a> |
| <a href=#161 id=161 data-nosnippet>161</a> <span class="comment">// Add any trait/regions obligations specified on the method's type parameters. |
| <a href=#162 id=162 data-nosnippet>162</a> // We won't add these if we encountered an illegal sized bound, so that we can use |
| <a href=#163 id=163 data-nosnippet>163</a> // a custom error in that case. |
| <a href=#164 id=164 data-nosnippet>164</a> </span><span class="kw">if </span>!illegal_sized_bound { |
| <a href=#165 id=165 data-nosnippet>165</a> <span class="self">self</span>.add_obligations(method_sig, all_args, method_predicates); |
| <a href=#166 id=166 data-nosnippet>166</a> } |
| <a href=#167 id=167 data-nosnippet>167</a> |
| <a href=#168 id=168 data-nosnippet>168</a> <span class="comment">// Create the final `MethodCallee`. |
| <a href=#169 id=169 data-nosnippet>169</a> </span><span class="kw">let </span>callee = MethodCallee { def_id: <span class="self">self</span>.candidate, args: all_args, sig: method_sig }; |
| <a href=#170 id=170 data-nosnippet>170</a> ConfirmResult { callee, illegal_sized_bound, adjustments } |
| <a href=#171 id=171 data-nosnippet>171</a> } |
| <a href=#172 id=172 data-nosnippet>172</a> |
| <a href=#173 id=173 data-nosnippet>173</a> <span class="comment">/////////////////////////////////////////////////////////////////////////// |
| <a href=#174 id=174 data-nosnippet>174</a> // ADJUSTMENTS |
| <a href=#175 id=175 data-nosnippet>175</a> |
| <a href=#176 id=176 data-nosnippet>176</a> </span><span class="kw">fn </span>adjust_self_ty( |
| <a href=#177 id=177 data-nosnippet>177</a> <span class="kw-2">&mut </span><span class="self">self</span>, |
| <a href=#178 id=178 data-nosnippet>178</a> unadjusted_self_ty: Ty<<span class="lifetime">'db</span>>, |
| <a href=#179 id=179 data-nosnippet>179</a> pick: <span class="kw-2">&</span>probe::Pick<<span class="lifetime">'db</span>>, |
| <a href=#180 id=180 data-nosnippet>180</a> ) -> (Ty<<span class="lifetime">'db</span>>, Box<[Adjustment]>) { |
| <a href=#181 id=181 data-nosnippet>181</a> <span class="comment">// Commit the autoderefs by calling `autoderef` again, but this |
| <a href=#182 id=182 data-nosnippet>182</a> // time writing the results into the various typeck results. |
| <a href=#183 id=183 data-nosnippet>183</a> </span><span class="kw">let </span><span class="kw-2">mut </span>autoderef = <span class="self">self</span>.ctx.table.autoderef_with_tracking(unadjusted_self_ty); |
| <a href=#184 id=184 data-nosnippet>184</a> <span class="kw">let </span><span class="prelude-val">Some</span>((<span class="kw-2">mut </span>target, n)) = autoderef.nth(pick.autoderefs) <span class="kw">else </span>{ |
| <a href=#185 id=185 data-nosnippet>185</a> <span class="kw">return </span>(Ty::new_error(<span class="self">self</span>.interner(), ErrorGuaranteed), Box::new([])); |
| <a href=#186 id=186 data-nosnippet>186</a> }; |
| <a href=#187 id=187 data-nosnippet>187</a> <span class="macro">assert_eq!</span>(n, pick.autoderefs); |
| <a href=#188 id=188 data-nosnippet>188</a> |
| <a href=#189 id=189 data-nosnippet>189</a> <span class="kw">let </span><span class="kw-2">mut </span>adjustments = |
| <a href=#190 id=190 data-nosnippet>190</a> <span class="self">self</span>.ctx.table.register_infer_ok(autoderef.adjust_steps_as_infer_ok()); |
| <a href=#191 id=191 data-nosnippet>191</a> <span class="kw">match </span>pick.autoref_or_ptr_adjustment { |
| <a href=#192 id=192 data-nosnippet>192</a> <span class="prelude-val">Some</span>(probe::AutorefOrPtrAdjustment::Autoref { mutbl, unsize }) => { |
| <a href=#193 id=193 data-nosnippet>193</a> <span class="kw">let </span>region = <span class="self">self</span>.infcx().next_region_var(); |
| <a href=#194 id=194 data-nosnippet>194</a> <span class="comment">// Type we're wrapping in a reference, used later for unsizing |
| <a href=#195 id=195 data-nosnippet>195</a> </span><span class="kw">let </span>base_ty = target; |
| <a href=#196 id=196 data-nosnippet>196</a> |
| <a href=#197 id=197 data-nosnippet>197</a> target = Ty::new_ref(<span class="self">self</span>.interner(), region, target, mutbl); |
| <a href=#198 id=198 data-nosnippet>198</a> |
| <a href=#199 id=199 data-nosnippet>199</a> <span class="comment">// Method call receivers are the primary use case |
| <a href=#200 id=200 data-nosnippet>200</a> // for two-phase borrows. |
| <a href=#201 id=201 data-nosnippet>201</a> </span><span class="kw">let </span>mutbl = AutoBorrowMutability::new(mutbl, AllowTwoPhase::Yes); |
| <a href=#202 id=202 data-nosnippet>202</a> |
| <a href=#203 id=203 data-nosnippet>203</a> adjustments.push(Adjustment { |
| <a href=#204 id=204 data-nosnippet>204</a> kind: Adjust::Borrow(AutoBorrow::Ref(mutbl)), |
| <a href=#205 id=205 data-nosnippet>205</a> target: target.store(), |
| <a href=#206 id=206 data-nosnippet>206</a> }); |
| <a href=#207 id=207 data-nosnippet>207</a> |
| <a href=#208 id=208 data-nosnippet>208</a> <span class="kw">if </span>unsize { |
| <a href=#209 id=209 data-nosnippet>209</a> <span class="kw">let </span>unsized_ty = <span class="kw">if let </span>TyKind::Array(elem_ty, <span class="kw">_</span>) = base_ty.kind() { |
| <a href=#210 id=210 data-nosnippet>210</a> Ty::new_slice(<span class="self">self</span>.interner(), elem_ty) |
| <a href=#211 id=211 data-nosnippet>211</a> } <span class="kw">else </span>{ |
| <a href=#212 id=212 data-nosnippet>212</a> <span class="macro">panic!</span>( |
| <a href=#213 id=213 data-nosnippet>213</a> <span class="string">"AutorefOrPtrAdjustment's unsize flag should only be set for array ty, found {:?}"</span>, |
| <a href=#214 id=214 data-nosnippet>214</a> base_ty |
| <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> target = Ty::new_ref(<span class="self">self</span>.interner(), region, unsized_ty, mutbl.into()); |
| <a href=#218 id=218 data-nosnippet>218</a> adjustments.push(Adjustment { |
| <a href=#219 id=219 data-nosnippet>219</a> kind: Adjust::Pointer(PointerCast::Unsize), |
| <a href=#220 id=220 data-nosnippet>220</a> target: target.store(), |
| <a href=#221 id=221 data-nosnippet>221</a> }); |
| <a href=#222 id=222 data-nosnippet>222</a> } |
| <a href=#223 id=223 data-nosnippet>223</a> } |
| <a href=#224 id=224 data-nosnippet>224</a> <span class="prelude-val">Some</span>(probe::AutorefOrPtrAdjustment::ToConstPtr) => { |
| <a href=#225 id=225 data-nosnippet>225</a> target = <span class="kw">match </span>target.kind() { |
| <a href=#226 id=226 data-nosnippet>226</a> TyKind::RawPtr(ty, mutbl) => { |
| <a href=#227 id=227 data-nosnippet>227</a> <span class="macro">assert!</span>(mutbl.is_mut()); |
| <a href=#228 id=228 data-nosnippet>228</a> Ty::new_imm_ptr(<span class="self">self</span>.interner(), ty) |
| <a href=#229 id=229 data-nosnippet>229</a> } |
| <a href=#230 id=230 data-nosnippet>230</a> other => <span class="macro">panic!</span>(<span class="string">"Cannot adjust receiver type {other:?} to const ptr"</span>), |
| <a href=#231 id=231 data-nosnippet>231</a> }; |
| <a href=#232 id=232 data-nosnippet>232</a> |
| <a href=#233 id=233 data-nosnippet>233</a> adjustments.push(Adjustment { |
| <a href=#234 id=234 data-nosnippet>234</a> kind: Adjust::Pointer(PointerCast::MutToConstPointer), |
| <a href=#235 id=235 data-nosnippet>235</a> target: target.store(), |
| <a href=#236 id=236 data-nosnippet>236</a> }); |
| <a href=#237 id=237 data-nosnippet>237</a> } |
| <a href=#238 id=238 data-nosnippet>238</a> <span class="prelude-val">None </span>=> {} |
| <a href=#239 id=239 data-nosnippet>239</a> } |
| <a href=#240 id=240 data-nosnippet>240</a> |
| <a href=#241 id=241 data-nosnippet>241</a> (target, adjustments.into_boxed_slice()) |
| <a href=#242 id=242 data-nosnippet>242</a> } |
| <a href=#243 id=243 data-nosnippet>243</a> |
| <a href=#244 id=244 data-nosnippet>244</a> <span class="doccomment">/// Returns a set of generic parameters for the method *receiver* where all type and region |
| <a href=#245 id=245 data-nosnippet>245</a> /// parameters are instantiated with fresh variables. This generic parameters does not include any |
| <a href=#246 id=246 data-nosnippet>246</a> /// parameters declared on the method itself. |
| <a href=#247 id=247 data-nosnippet>247</a> /// |
| <a href=#248 id=248 data-nosnippet>248</a> /// Note that this generic parameters may include late-bound regions from the impl level. If so, |
| <a href=#249 id=249 data-nosnippet>249</a> /// these are instantiated later in the `instantiate_method_sig` routine. |
| <a href=#250 id=250 data-nosnippet>250</a> </span><span class="kw">fn </span>fresh_receiver_args( |
| <a href=#251 id=251 data-nosnippet>251</a> <span class="kw-2">&mut </span><span class="self">self</span>, |
| <a href=#252 id=252 data-nosnippet>252</a> self_ty: Ty<<span class="lifetime">'db</span>>, |
| <a href=#253 id=253 data-nosnippet>253</a> pick: <span class="kw-2">&</span>probe::Pick<<span class="lifetime">'db</span>>, |
| <a href=#254 id=254 data-nosnippet>254</a> ) -> GenericArgs<<span class="lifetime">'db</span>> { |
| <a href=#255 id=255 data-nosnippet>255</a> <span class="kw">match </span>pick.kind { |
| <a href=#256 id=256 data-nosnippet>256</a> probe::InherentImplPick(impl_def_id) => { |
| <a href=#257 id=257 data-nosnippet>257</a> <span class="self">self</span>.infcx().fresh_args_for_item(impl_def_id.into()) |
| <a href=#258 id=258 data-nosnippet>258</a> } |
| <a href=#259 id=259 data-nosnippet>259</a> |
| <a href=#260 id=260 data-nosnippet>260</a> probe::ObjectPick(trait_def_id) => { |
| <a href=#261 id=261 data-nosnippet>261</a> <span class="comment">// If the trait is not object safe (specifically, we care about when |
| <a href=#262 id=262 data-nosnippet>262</a> // the receiver is not valid), then there's a chance that we will not |
| <a href=#263 id=263 data-nosnippet>263</a> // actually be able to recover the object by derefing the receiver like |
| <a href=#264 id=264 data-nosnippet>264</a> // we should if it were valid. |
| <a href=#265 id=265 data-nosnippet>265</a> </span><span class="kw">if </span><span class="self">self</span>.db().dyn_compatibility_of_trait(trait_def_id).is_some() { |
| <a href=#266 id=266 data-nosnippet>266</a> <span class="kw">return </span>GenericArgs::error_for_item(<span class="self">self</span>.interner(), trait_def_id.into()); |
| <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="self">self</span>.extract_existential_trait_ref(self_ty, |this, object_ty, principal| { |
| <a href=#270 id=270 data-nosnippet>270</a> <span class="comment">// The object data has no entry for the Self |
| <a href=#271 id=271 data-nosnippet>271</a> // Type. For the purposes of this method call, we |
| <a href=#272 id=272 data-nosnippet>272</a> // instantiate the object type itself. This |
| <a href=#273 id=273 data-nosnippet>273</a> // wouldn't be a sound instantiation in all cases, |
| <a href=#274 id=274 data-nosnippet>274</a> // since each instance of the object type is a |
| <a href=#275 id=275 data-nosnippet>275</a> // different existential and hence could match |
| <a href=#276 id=276 data-nosnippet>276</a> // distinct types (e.g., if `Self` appeared as an |
| <a href=#277 id=277 data-nosnippet>277</a> // argument type), but those cases have already |
| <a href=#278 id=278 data-nosnippet>278</a> // been ruled out when we deemed the trait to be |
| <a href=#279 id=279 data-nosnippet>279</a> // "dyn-compatible". |
| <a href=#280 id=280 data-nosnippet>280</a> </span><span class="kw">let </span>original_poly_trait_ref = |
| <a href=#281 id=281 data-nosnippet>281</a> principal.with_self_ty(this.interner(), object_ty); |
| <a href=#282 id=282 data-nosnippet>282</a> <span class="kw">let </span>upcast_poly_trait_ref = this.upcast(original_poly_trait_ref, trait_def_id); |
| <a href=#283 id=283 data-nosnippet>283</a> <span class="kw">let </span>upcast_trait_ref = |
| <a href=#284 id=284 data-nosnippet>284</a> this.instantiate_binder_with_fresh_vars(upcast_poly_trait_ref); |
| <a href=#285 id=285 data-nosnippet>285</a> <span class="macro">debug!</span>( |
| <a href=#286 id=286 data-nosnippet>286</a> <span class="string">"original_poly_trait_ref={:?} upcast_trait_ref={:?} target_trait={:?}"</span>, |
| <a href=#287 id=287 data-nosnippet>287</a> original_poly_trait_ref, upcast_trait_ref, trait_def_id |
| <a href=#288 id=288 data-nosnippet>288</a> ); |
| <a href=#289 id=289 data-nosnippet>289</a> upcast_trait_ref.args |
| <a href=#290 id=290 data-nosnippet>290</a> }) |
| <a href=#291 id=291 data-nosnippet>291</a> } |
| <a href=#292 id=292 data-nosnippet>292</a> |
| <a href=#293 id=293 data-nosnippet>293</a> probe::TraitPick(trait_def_id) => { |
| <a href=#294 id=294 data-nosnippet>294</a> <span class="comment">// Make a trait reference `$0 : Trait<$1...$n>` |
| <a href=#295 id=295 data-nosnippet>295</a> // consisting entirely of type variables. Later on in |
| <a href=#296 id=296 data-nosnippet>296</a> // the process we will unify the transformed-self-type |
| <a href=#297 id=297 data-nosnippet>297</a> // of the method with the actual type in order to |
| <a href=#298 id=298 data-nosnippet>298</a> // unify some of these variables. |
| <a href=#299 id=299 data-nosnippet>299</a> </span><span class="self">self</span>.infcx().fresh_args_for_item(trait_def_id.into()) |
| <a href=#300 id=300 data-nosnippet>300</a> } |
| <a href=#301 id=301 data-nosnippet>301</a> |
| <a href=#302 id=302 data-nosnippet>302</a> probe::WhereClausePick(poly_trait_ref) => { |
| <a href=#303 id=303 data-nosnippet>303</a> <span class="comment">// Where clauses can have bound regions in them. We need to instantiate |
| <a href=#304 id=304 data-nosnippet>304</a> // those to convert from a poly-trait-ref to a trait-ref. |
| <a href=#305 id=305 data-nosnippet>305</a> </span><span class="self">self</span>.instantiate_binder_with_fresh_vars(poly_trait_ref).args |
| <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> <span class="kw">fn </span>extract_existential_trait_ref<R, F>(<span class="kw-2">&</span><span class="self">self</span>, self_ty: Ty<<span class="lifetime">'db</span>>, <span class="kw-2">mut </span>closure: F) -> R |
| <a href=#311 id=311 data-nosnippet>311</a> <span class="kw">where |
| <a href=#312 id=312 data-nosnippet>312</a> </span>F: FnMut(<span class="kw-2">&</span>ConfirmContext<<span class="lifetime">'a</span>, <span class="lifetime">'b</span>, <span class="lifetime">'db</span>>, Ty<<span class="lifetime">'db</span>>, PolyExistentialTraitRef<<span class="lifetime">'db</span>>) -> R, |
| <a href=#313 id=313 data-nosnippet>313</a> { |
| <a href=#314 id=314 data-nosnippet>314</a> <span class="comment">// If we specified that this is an object method, then the |
| <a href=#315 id=315 data-nosnippet>315</a> // self-type ought to be something that can be dereferenced to |
| <a href=#316 id=316 data-nosnippet>316</a> // yield an object-type (e.g., `&Object` or `Box<Object>` |
| <a href=#317 id=317 data-nosnippet>317</a> // etc). |
| <a href=#318 id=318 data-nosnippet>318</a> |
| <a href=#319 id=319 data-nosnippet>319</a> </span><span class="kw">let </span><span class="kw-2">mut </span>autoderef = <span class="self">self</span>.ctx.table.autoderef(self_ty); |
| <a href=#320 id=320 data-nosnippet>320</a> |
| <a href=#321 id=321 data-nosnippet>321</a> <span class="comment">// We don't need to gate this behind arbitrary self types |
| <a href=#322 id=322 data-nosnippet>322</a> // per se, but it does make things a bit more gated. |
| <a href=#323 id=323 data-nosnippet>323</a> </span><span class="kw">if </span><span class="self">self</span>.ctx.unstable_features.arbitrary_self_types |
| <a href=#324 id=324 data-nosnippet>324</a> || <span class="self">self</span>.ctx.unstable_features.arbitrary_self_types_pointers |
| <a href=#325 id=325 data-nosnippet>325</a> { |
| <a href=#326 id=326 data-nosnippet>326</a> autoderef = autoderef.use_receiver_trait(); |
| <a href=#327 id=327 data-nosnippet>327</a> } |
| <a href=#328 id=328 data-nosnippet>328</a> |
| <a href=#329 id=329 data-nosnippet>329</a> autoderef |
| <a href=#330 id=330 data-nosnippet>330</a> .include_raw_pointers() |
| <a href=#331 id=331 data-nosnippet>331</a> .find_map(|(ty, <span class="kw">_</span>)| <span class="kw">match </span>ty.kind() { |
| <a href=#332 id=332 data-nosnippet>332</a> TyKind::Dynamic(data, ..) => <span class="prelude-val">Some</span>(closure( |
| <a href=#333 id=333 data-nosnippet>333</a> <span class="self">self</span>, |
| <a href=#334 id=334 data-nosnippet>334</a> ty, |
| <a href=#335 id=335 data-nosnippet>335</a> data.principal().expect(<span class="string">"calling trait method on empty object?"</span>), |
| <a href=#336 id=336 data-nosnippet>336</a> )), |
| <a href=#337 id=337 data-nosnippet>337</a> <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| <a href=#338 id=338 data-nosnippet>338</a> }) |
| <a href=#339 id=339 data-nosnippet>339</a> .unwrap_or_else(|| { |
| <a href=#340 id=340 data-nosnippet>340</a> <span class="macro">panic!</span>(<span class="string">"self-type `{:?}` for ObjectPick never dereferenced to an object"</span>, self_ty) |
| <a href=#341 id=341 data-nosnippet>341</a> }) |
| <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">fn </span>instantiate_method_args( |
| <a href=#345 id=345 data-nosnippet>345</a> <span class="kw-2">&mut </span><span class="self">self</span>, |
| <a href=#346 id=346 data-nosnippet>346</a> generic_args: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>HirGenericArgs>, |
| <a href=#347 id=347 data-nosnippet>347</a> parent_args: GenericArgs<<span class="lifetime">'db</span>>, |
| <a href=#348 id=348 data-nosnippet>348</a> ) -> GenericArgs<<span class="lifetime">'db</span>> { |
| <a href=#349 id=349 data-nosnippet>349</a> <span class="kw">struct </span>LowererCtx<<span class="lifetime">'a</span>, <span class="lifetime">'b</span>, <span class="lifetime">'db</span>> { |
| <a href=#350 id=350 data-nosnippet>350</a> ctx: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>InferenceContext<<span class="lifetime">'b</span>, <span class="lifetime">'db</span>>, |
| <a href=#351 id=351 data-nosnippet>351</a> expr: ExprId, |
| <a href=#352 id=352 data-nosnippet>352</a> parent_args: <span class="kw-2">&</span><span class="lifetime">'a </span>[GenericArg<<span class="lifetime">'db</span>>], |
| <a href=#353 id=353 data-nosnippet>353</a> } |
| <a href=#354 id=354 data-nosnippet>354</a> |
| <a href=#355 id=355 data-nosnippet>355</a> <span class="kw">impl</span><<span class="lifetime">'db</span>> GenericArgsLowerer<<span class="lifetime">'db</span>> <span class="kw">for </span>LowererCtx<<span class="lifetime">'_</span>, <span class="lifetime">'_</span>, <span class="lifetime">'db</span>> { |
| <a href=#356 id=356 data-nosnippet>356</a> <span class="kw">fn </span>report_len_mismatch( |
| <a href=#357 id=357 data-nosnippet>357</a> <span class="kw-2">&mut </span><span class="self">self</span>, |
| <a href=#358 id=358 data-nosnippet>358</a> def: GenericDefId, |
| <a href=#359 id=359 data-nosnippet>359</a> provided_count: u32, |
| <a href=#360 id=360 data-nosnippet>360</a> expected_count: u32, |
| <a href=#361 id=361 data-nosnippet>361</a> kind: IncorrectGenericsLenKind, |
| <a href=#362 id=362 data-nosnippet>362</a> ) { |
| <a href=#363 id=363 data-nosnippet>363</a> <span class="self">self</span>.ctx.push_diagnostic(InferenceDiagnostic::MethodCallIncorrectGenericsLen { |
| <a href=#364 id=364 data-nosnippet>364</a> expr: <span class="self">self</span>.expr, |
| <a href=#365 id=365 data-nosnippet>365</a> provided_count, |
| <a href=#366 id=366 data-nosnippet>366</a> expected_count, |
| <a href=#367 id=367 data-nosnippet>367</a> kind, |
| <a href=#368 id=368 data-nosnippet>368</a> def, |
| <a href=#369 id=369 data-nosnippet>369</a> }); |
| <a href=#370 id=370 data-nosnippet>370</a> } |
| <a href=#371 id=371 data-nosnippet>371</a> |
| <a href=#372 id=372 data-nosnippet>372</a> <span class="kw">fn </span>report_arg_mismatch( |
| <a href=#373 id=373 data-nosnippet>373</a> <span class="kw-2">&mut </span><span class="self">self</span>, |
| <a href=#374 id=374 data-nosnippet>374</a> param_id: GenericParamId, |
| <a href=#375 id=375 data-nosnippet>375</a> arg_idx: u32, |
| <a href=#376 id=376 data-nosnippet>376</a> has_self_arg: bool, |
| <a href=#377 id=377 data-nosnippet>377</a> ) { |
| <a href=#378 id=378 data-nosnippet>378</a> <span class="self">self</span>.ctx.push_diagnostic(InferenceDiagnostic::MethodCallIncorrectGenericsOrder { |
| <a href=#379 id=379 data-nosnippet>379</a> expr: <span class="self">self</span>.expr, |
| <a href=#380 id=380 data-nosnippet>380</a> param_id, |
| <a href=#381 id=381 data-nosnippet>381</a> arg_idx, |
| <a href=#382 id=382 data-nosnippet>382</a> has_self_arg, |
| <a href=#383 id=383 data-nosnippet>383</a> }); |
| <a href=#384 id=384 data-nosnippet>384</a> } |
| <a href=#385 id=385 data-nosnippet>385</a> |
| <a href=#386 id=386 data-nosnippet>386</a> <span class="kw">fn </span>provided_kind( |
| <a href=#387 id=387 data-nosnippet>387</a> <span class="kw-2">&mut </span><span class="self">self</span>, |
| <a href=#388 id=388 data-nosnippet>388</a> param_id: GenericParamId, |
| <a href=#389 id=389 data-nosnippet>389</a> param: GenericParamDataRef<<span class="lifetime">'_</span>>, |
| <a href=#390 id=390 data-nosnippet>390</a> arg: <span class="kw-2">&</span>HirGenericArg, |
| <a href=#391 id=391 data-nosnippet>391</a> ) -> GenericArg<<span class="lifetime">'db</span>> { |
| <a href=#392 id=392 data-nosnippet>392</a> <span class="kw">match </span>(param, arg) { |
| <a href=#393 id=393 data-nosnippet>393</a> ( |
| <a href=#394 id=394 data-nosnippet>394</a> GenericParamDataRef::LifetimeParamData(<span class="kw">_</span>), |
| <a href=#395 id=395 data-nosnippet>395</a> HirGenericArg::Lifetime(lifetime), |
| <a href=#396 id=396 data-nosnippet>396</a> ) => <span class="self">self</span>.ctx.make_body_lifetime(<span class="kw-2">*</span>lifetime).into(), |
| <a href=#397 id=397 data-nosnippet>397</a> (GenericParamDataRef::TypeParamData(<span class="kw">_</span>), HirGenericArg::Type(type_ref)) => { |
| <a href=#398 id=398 data-nosnippet>398</a> <span class="self">self</span>.ctx.make_body_ty(<span class="kw-2">*</span>type_ref).into() |
| <a href=#399 id=399 data-nosnippet>399</a> } |
| <a href=#400 id=400 data-nosnippet>400</a> (GenericParamDataRef::ConstParamData(<span class="kw">_</span>), HirGenericArg::Const(konst)) => { |
| <a href=#401 id=401 data-nosnippet>401</a> <span class="kw">let </span>GenericParamId::ConstParamId(const_id) = param_id <span class="kw">else </span>{ |
| <a href=#402 id=402 data-nosnippet>402</a> <span class="macro">unreachable!</span>(<span class="string">"non-const param ID for const param"</span>); |
| <a href=#403 id=403 data-nosnippet>403</a> }; |
| <a href=#404 id=404 data-nosnippet>404</a> <span class="kw">let </span>const_ty = <span class="self">self</span>.ctx.db.const_param_ty_ns(const_id); |
| <a href=#405 id=405 data-nosnippet>405</a> <span class="self">self</span>.ctx.make_body_const(<span class="kw-2">*</span>konst, const_ty).into() |
| <a href=#406 id=406 data-nosnippet>406</a> } |
| <a href=#407 id=407 data-nosnippet>407</a> <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(<span class="string">"unmatching param kinds were passed to `provided_kind()`"</span>), |
| <a href=#408 id=408 data-nosnippet>408</a> } |
| <a href=#409 id=409 data-nosnippet>409</a> } |
| <a href=#410 id=410 data-nosnippet>410</a> |
| <a href=#411 id=411 data-nosnippet>411</a> <span class="kw">fn </span>provided_type_like_const( |
| <a href=#412 id=412 data-nosnippet>412</a> <span class="kw-2">&mut </span><span class="self">self</span>, |
| <a href=#413 id=413 data-nosnippet>413</a> const_ty: Ty<<span class="lifetime">'db</span>>, |
| <a href=#414 id=414 data-nosnippet>414</a> arg: TypeLikeConst<<span class="lifetime">'_</span>>, |
| <a href=#415 id=415 data-nosnippet>415</a> ) -> Const<<span class="lifetime">'db</span>> { |
| <a href=#416 id=416 data-nosnippet>416</a> <span class="kw">match </span>arg { |
| <a href=#417 id=417 data-nosnippet>417</a> TypeLikeConst::Path(path) => <span class="self">self</span>.ctx.make_path_as_body_const(path, const_ty), |
| <a href=#418 id=418 data-nosnippet>418</a> TypeLikeConst::Infer => <span class="self">self</span>.ctx.table.next_const_var(), |
| <a href=#419 id=419 data-nosnippet>419</a> } |
| <a href=#420 id=420 data-nosnippet>420</a> } |
| <a href=#421 id=421 data-nosnippet>421</a> |
| <a href=#422 id=422 data-nosnippet>422</a> <span class="kw">fn </span>inferred_kind( |
| <a href=#423 id=423 data-nosnippet>423</a> <span class="kw-2">&mut </span><span class="self">self</span>, |
| <a href=#424 id=424 data-nosnippet>424</a> _def: GenericDefId, |
| <a href=#425 id=425 data-nosnippet>425</a> param_id: GenericParamId, |
| <a href=#426 id=426 data-nosnippet>426</a> _param: GenericParamDataRef<<span class="lifetime">'_</span>>, |
| <a href=#427 id=427 data-nosnippet>427</a> _infer_args: bool, |
| <a href=#428 id=428 data-nosnippet>428</a> _preceding_args: <span class="kw-2">&</span>[GenericArg<<span class="lifetime">'db</span>>], |
| <a href=#429 id=429 data-nosnippet>429</a> ) -> GenericArg<<span class="lifetime">'db</span>> { |
| <a href=#430 id=430 data-nosnippet>430</a> <span class="comment">// Always create an inference var, even when `infer_args == false`. This helps with diagnostics, |
| <a href=#431 id=431 data-nosnippet>431</a> // and I think it's also required in the presence of `impl Trait` (that must be inferred). |
| <a href=#432 id=432 data-nosnippet>432</a> </span><span class="self">self</span>.ctx.table.next_var_for_param(param_id) |
| <a href=#433 id=433 data-nosnippet>433</a> } |
| <a href=#434 id=434 data-nosnippet>434</a> |
| <a href=#435 id=435 data-nosnippet>435</a> <span class="kw">fn </span>parent_arg(<span class="kw-2">&mut </span><span class="self">self</span>, param_idx: u32, _param_id: GenericParamId) -> GenericArg<<span class="lifetime">'db</span>> { |
| <a href=#436 id=436 data-nosnippet>436</a> <span class="self">self</span>.parent_args[param_idx <span class="kw">as </span>usize] |
| <a href=#437 id=437 data-nosnippet>437</a> } |
| <a href=#438 id=438 data-nosnippet>438</a> |
| <a href=#439 id=439 data-nosnippet>439</a> <span class="kw">fn </span>report_elided_lifetimes_in_path( |
| <a href=#440 id=440 data-nosnippet>440</a> <span class="kw-2">&mut </span><span class="self">self</span>, |
| <a href=#441 id=441 data-nosnippet>441</a> _def: GenericDefId, |
| <a href=#442 id=442 data-nosnippet>442</a> _expected_count: u32, |
| <a href=#443 id=443 data-nosnippet>443</a> _hard_error: bool, |
| <a href=#444 id=444 data-nosnippet>444</a> ) { |
| <a href=#445 id=445 data-nosnippet>445</a> <span class="macro">unreachable!</span>(<span class="string">"we set `LifetimeElisionKind::Infer`"</span>) |
| <a href=#446 id=446 data-nosnippet>446</a> } |
| <a href=#447 id=447 data-nosnippet>447</a> |
| <a href=#448 id=448 data-nosnippet>448</a> <span class="kw">fn </span>report_elision_failure(<span class="kw-2">&mut </span><span class="self">self</span>, _def: GenericDefId, _expected_count: u32) { |
| <a href=#449 id=449 data-nosnippet>449</a> <span class="macro">unreachable!</span>(<span class="string">"we set `LifetimeElisionKind::Infer`"</span>) |
| <a href=#450 id=450 data-nosnippet>450</a> } |
| <a href=#451 id=451 data-nosnippet>451</a> |
| <a href=#452 id=452 data-nosnippet>452</a> <span class="kw">fn </span>report_missing_lifetime(<span class="kw-2">&mut </span><span class="self">self</span>, _def: GenericDefId, _expected_count: u32) { |
| <a href=#453 id=453 data-nosnippet>453</a> <span class="macro">unreachable!</span>(<span class="string">"we set `LifetimeElisionKind::Infer`"</span>) |
| <a href=#454 id=454 data-nosnippet>454</a> } |
| <a href=#455 id=455 data-nosnippet>455</a> } |
| <a href=#456 id=456 data-nosnippet>456</a> |
| <a href=#457 id=457 data-nosnippet>457</a> substs_from_args_and_bindings( |
| <a href=#458 id=458 data-nosnippet>458</a> <span class="self">self</span>.db(), |
| <a href=#459 id=459 data-nosnippet>459</a> <span class="self">self</span>.ctx.store, |
| <a href=#460 id=460 data-nosnippet>460</a> generic_args, |
| <a href=#461 id=461 data-nosnippet>461</a> <span class="self">self</span>.candidate.into(), |
| <a href=#462 id=462 data-nosnippet>462</a> <span class="bool-val">true</span>, |
| <a href=#463 id=463 data-nosnippet>463</a> LifetimeElisionKind::Infer, |
| <a href=#464 id=464 data-nosnippet>464</a> <span class="bool-val">false</span>, |
| <a href=#465 id=465 data-nosnippet>465</a> <span class="prelude-val">None</span>, |
| <a href=#466 id=466 data-nosnippet>466</a> <span class="kw-2">&mut </span>LowererCtx { ctx: <span class="self">self</span>.ctx, expr: <span class="self">self</span>.expr, parent_args: parent_args.as_slice() }, |
| <a href=#467 id=467 data-nosnippet>467</a> ) |
| <a href=#468 id=468 data-nosnippet>468</a> } |
| <a href=#469 id=469 data-nosnippet>469</a> |
| <a href=#470 id=470 data-nosnippet>470</a> <span class="kw">fn </span>unify_receivers( |
| <a href=#471 id=471 data-nosnippet>471</a> <span class="kw-2">&mut </span><span class="self">self</span>, |
| <a href=#472 id=472 data-nosnippet>472</a> self_ty: Ty<<span class="lifetime">'db</span>>, |
| <a href=#473 id=473 data-nosnippet>473</a> method_self_ty: Ty<<span class="lifetime">'db</span>>, |
| <a href=#474 id=474 data-nosnippet>474</a> pick: <span class="kw-2">&</span>probe::Pick<<span class="lifetime">'db</span>>, |
| <a href=#475 id=475 data-nosnippet>475</a> ) { |
| <a href=#476 id=476 data-nosnippet>476</a> <span class="macro">debug!</span>( |
| <a href=#477 id=477 data-nosnippet>477</a> <span class="string">"unify_receivers: self_ty={:?} method_self_ty={:?} pick={:?}"</span>, |
| <a href=#478 id=478 data-nosnippet>478</a> self_ty, method_self_ty, pick |
| <a href=#479 id=479 data-nosnippet>479</a> ); |
| <a href=#480 id=480 data-nosnippet>480</a> <span class="kw">let </span>cause = ObligationCause::new(); |
| <a href=#481 id=481 data-nosnippet>481</a> <span class="kw">match </span><span class="self">self</span>.ctx.table.at(<span class="kw-2">&</span>cause).sup(method_self_ty, self_ty) { |
| <a href=#482 id=482 data-nosnippet>482</a> <span class="prelude-val">Ok</span>(infer_ok) => { |
| <a href=#483 id=483 data-nosnippet>483</a> <span class="self">self</span>.ctx.table.register_infer_ok(infer_ok); |
| <a href=#484 id=484 data-nosnippet>484</a> } |
| <a href=#485 id=485 data-nosnippet>485</a> <span class="prelude-val">Err</span>(<span class="kw">_</span>) => { |
| <a href=#486 id=486 data-nosnippet>486</a> <span class="kw">if </span><span class="self">self</span>.ctx.unstable_features.arbitrary_self_types { |
| <a href=#487 id=487 data-nosnippet>487</a> <span class="self">self</span>.ctx.result.type_mismatches.get_or_insert_default().insert( |
| <a href=#488 id=488 data-nosnippet>488</a> <span class="self">self</span>.expr.into(), |
| <a href=#489 id=489 data-nosnippet>489</a> TypeMismatch { expected: method_self_ty.store(), actual: self_ty.store() }, |
| <a href=#490 id=490 data-nosnippet>490</a> ); |
| <a href=#491 id=491 data-nosnippet>491</a> } |
| <a href=#492 id=492 data-nosnippet>492</a> } |
| <a href=#493 id=493 data-nosnippet>493</a> } |
| <a href=#494 id=494 data-nosnippet>494</a> } |
| <a href=#495 id=495 data-nosnippet>495</a> |
| <a href=#496 id=496 data-nosnippet>496</a> <span class="comment">// NOTE: this returns the *unnormalized* predicates and method sig. Because of |
| <a href=#497 id=497 data-nosnippet>497</a> // inference guessing, the predicates and method signature can't be normalized |
| <a href=#498 id=498 data-nosnippet>498</a> // until we unify the `Self` type. |
| <a href=#499 id=499 data-nosnippet>499</a> </span><span class="kw">fn </span>instantiate_method_sig<<span class="lifetime">'c</span>>( |
| <a href=#500 id=500 data-nosnippet>500</a> <span class="kw-2">&mut </span><span class="self">self</span>, |
| <a href=#501 id=501 data-nosnippet>501</a> pick: <span class="kw-2">&</span>probe::Pick<<span class="lifetime">'db</span>>, |
| <a href=#502 id=502 data-nosnippet>502</a> all_args: <span class="kw-2">&</span><span class="lifetime">'c </span>[GenericArg<<span class="lifetime">'db</span>>], |
| <a href=#503 id=503 data-nosnippet>503</a> ) -> (FnSig<<span class="lifetime">'db</span>>, <span class="kw">impl </span>Iterator<Item = PredicateObligation<<span class="lifetime">'db</span>>> + <span class="kw">use</span><<span class="lifetime">'c</span>, <span class="lifetime">'db</span>>) { |
| <a href=#504 id=504 data-nosnippet>504</a> <span class="macro">debug!</span>(<span class="string">"instantiate_method_sig(pick={:?}, all_args={:?})"</span>, pick, all_args); |
| <a href=#505 id=505 data-nosnippet>505</a> |
| <a href=#506 id=506 data-nosnippet>506</a> <span class="comment">// Instantiate the bounds on the method with the |
| <a href=#507 id=507 data-nosnippet>507</a> // type/early-bound-regions instantiations performed. There can |
| <a href=#508 id=508 data-nosnippet>508</a> // be no late-bound regions appearing here. |
| <a href=#509 id=509 data-nosnippet>509</a> </span><span class="kw">let </span>def_id = <span class="self">self</span>.candidate; |
| <a href=#510 id=510 data-nosnippet>510</a> <span class="kw">let </span>method_predicates = clauses_as_obligations( |
| <a href=#511 id=511 data-nosnippet>511</a> GenericPredicates::query_all(<span class="self">self</span>.db(), def_id.into()) |
| <a href=#512 id=512 data-nosnippet>512</a> .iter_instantiated(<span class="self">self</span>.interner(), all_args), |
| <a href=#513 id=513 data-nosnippet>513</a> ObligationCause::new(), |
| <a href=#514 id=514 data-nosnippet>514</a> <span class="self">self</span>.ctx.table.param_env, |
| <a href=#515 id=515 data-nosnippet>515</a> ); |
| <a href=#516 id=516 data-nosnippet>516</a> |
| <a href=#517 id=517 data-nosnippet>517</a> <span class="kw">let </span>sig = |
| <a href=#518 id=518 data-nosnippet>518</a> <span class="self">self</span>.db().callable_item_signature(def_id.into()).instantiate(<span class="self">self</span>.interner(), all_args); |
| <a href=#519 id=519 data-nosnippet>519</a> <span class="macro">debug!</span>(<span class="string">"type scheme instantiated, sig={:?}"</span>, sig); |
| <a href=#520 id=520 data-nosnippet>520</a> |
| <a href=#521 id=521 data-nosnippet>521</a> <span class="kw">let </span>sig = <span class="self">self</span>.instantiate_binder_with_fresh_vars(sig); |
| <a href=#522 id=522 data-nosnippet>522</a> <span class="macro">debug!</span>(<span class="string">"late-bound lifetimes from method instantiated, sig={:?}"</span>, sig); |
| <a href=#523 id=523 data-nosnippet>523</a> |
| <a href=#524 id=524 data-nosnippet>524</a> (sig, method_predicates) |
| <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> <span class="kw">fn </span>add_obligations( |
| <a href=#528 id=528 data-nosnippet>528</a> <span class="kw-2">&mut </span><span class="self">self</span>, |
| <a href=#529 id=529 data-nosnippet>529</a> sig: FnSig<<span class="lifetime">'db</span>>, |
| <a href=#530 id=530 data-nosnippet>530</a> all_args: GenericArgs<<span class="lifetime">'db</span>>, |
| <a href=#531 id=531 data-nosnippet>531</a> method_predicates: <span class="kw">impl </span>Iterator<Item = PredicateObligation<<span class="lifetime">'db</span>>>, |
| <a href=#532 id=532 data-nosnippet>532</a> ) { |
| <a href=#533 id=533 data-nosnippet>533</a> <span class="macro">debug!</span>(<span class="string">"add_obligations: sig={:?} all_args={:?}"</span>, sig, all_args); |
| <a href=#534 id=534 data-nosnippet>534</a> |
| <a href=#535 id=535 data-nosnippet>535</a> <span class="self">self</span>.ctx.table.register_predicates(method_predicates); |
| <a href=#536 id=536 data-nosnippet>536</a> |
| <a href=#537 id=537 data-nosnippet>537</a> <span class="comment">// this is a projection from a trait reference, so we have to |
| <a href=#538 id=538 data-nosnippet>538</a> // make sure that the trait reference inputs are well-formed. |
| <a href=#539 id=539 data-nosnippet>539</a> </span><span class="self">self</span>.ctx.table.add_wf_bounds(all_args); |
| <a href=#540 id=540 data-nosnippet>540</a> |
| <a href=#541 id=541 data-nosnippet>541</a> <span class="comment">// the function type must also be well-formed (this is not |
| <a href=#542 id=542 data-nosnippet>542</a> // implied by the args being well-formed because of inherent |
| <a href=#543 id=543 data-nosnippet>543</a> // impls and late-bound regions - see issue #28609). |
| <a href=#544 id=544 data-nosnippet>544</a> </span><span class="kw">for </span>ty <span class="kw">in </span>sig.inputs_and_output { |
| <a href=#545 id=545 data-nosnippet>545</a> <span class="self">self</span>.ctx.table.register_wf_obligation(ty.into(), ObligationCause::new()); |
| <a href=#546 id=546 data-nosnippet>546</a> } |
| <a href=#547 id=547 data-nosnippet>547</a> } |
| <a href=#548 id=548 data-nosnippet>548</a> |
| <a href=#549 id=549 data-nosnippet>549</a> <span class="comment">/////////////////////////////////////////////////////////////////////////// |
| <a href=#550 id=550 data-nosnippet>550</a> // MISCELLANY |
| <a href=#551 id=551 data-nosnippet>551</a> |
| <a href=#552 id=552 data-nosnippet>552</a> </span><span class="kw">fn </span>predicates_require_illegal_sized_bound( |
| <a href=#553 id=553 data-nosnippet>553</a> <span class="kw-2">&</span><span class="self">self</span>, |
| <a href=#554 id=554 data-nosnippet>554</a> predicates: <span class="kw">impl </span>Iterator<Item = Clause<<span class="lifetime">'db</span>>>, |
| <a href=#555 id=555 data-nosnippet>555</a> ) -> bool { |
| <a href=#556 id=556 data-nosnippet>556</a> <span class="kw">let </span><span class="prelude-val">Some</span>(sized_def_id) = <span class="self">self</span>.ctx.lang_items.Sized <span class="kw">else </span>{ |
| <a href=#557 id=557 data-nosnippet>557</a> <span class="kw">return </span><span class="bool-val">false</span>; |
| <a href=#558 id=558 data-nosnippet>558</a> }; |
| <a href=#559 id=559 data-nosnippet>559</a> |
| <a href=#560 id=560 data-nosnippet>560</a> elaborate(<span class="self">self</span>.interner(), predicates) |
| <a href=#561 id=561 data-nosnippet>561</a> <span class="comment">// We don't care about regions here. |
| <a href=#562 id=562 data-nosnippet>562</a> </span>.filter_map(|pred| <span class="kw">match </span>pred.kind().skip_binder() { |
| <a href=#563 id=563 data-nosnippet>563</a> ClauseKind::Trait(trait_pred) <span class="kw">if </span>trait_pred.def_id().<span class="number">0 </span>== sized_def_id => { |
| <a href=#564 id=564 data-nosnippet>564</a> <span class="prelude-val">Some</span>(trait_pred) |
| <a href=#565 id=565 data-nosnippet>565</a> } |
| <a href=#566 id=566 data-nosnippet>566</a> <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| <a href=#567 id=567 data-nosnippet>567</a> }) |
| <a href=#568 id=568 data-nosnippet>568</a> .any(|trait_pred| <span class="macro">matches!</span>(trait_pred.self_ty().kind(), TyKind::Dynamic(..))) |
| <a href=#569 id=569 data-nosnippet>569</a> } |
| <a href=#570 id=570 data-nosnippet>570</a> |
| <a href=#571 id=571 data-nosnippet>571</a> <span class="kw">fn </span>check_for_illegal_method_calls(<span class="kw-2">&</span><span class="self">self</span>) { |
| <a href=#572 id=572 data-nosnippet>572</a> <span class="comment">// Disallow calls to the method `drop` defined in the `Drop` trait. |
| <a href=#573 id=573 data-nosnippet>573</a> </span><span class="kw">if let </span>ItemContainerId::TraitId(trait_def_id) = <span class="self">self</span>.candidate.loc(<span class="self">self</span>.db()).container |
| <a href=#574 id=574 data-nosnippet>574</a> && <span class="self">self</span>.ctx.lang_items.Drop.is_some_and(|drop_trait| drop_trait == trait_def_id) |
| <a href=#575 id=575 data-nosnippet>575</a> { |
| <a href=#576 id=576 data-nosnippet>576</a> <span class="comment">// FIXME: Report an error. |
| <a href=#577 id=577 data-nosnippet>577</a> </span>} |
| <a href=#578 id=578 data-nosnippet>578</a> } |
| <a href=#579 id=579 data-nosnippet>579</a> |
| <a href=#580 id=580 data-nosnippet>580</a> <span class="attr">#[expect(clippy::needless_return)] |
| <a href=#581 id=581 data-nosnippet>581</a> </span><span class="kw">fn </span>lint_shadowed_supertrait_items(<span class="kw-2">&</span><span class="self">self</span>, pick: <span class="kw-2">&</span>probe::Pick<<span class="lifetime">'_</span>>) { |
| <a href=#582 id=582 data-nosnippet>582</a> <span class="kw">if </span>pick.shadowed_candidates.is_empty() { |
| <a href=#583 id=583 data-nosnippet>583</a> <span class="kw">return</span>; |
| <a href=#584 id=584 data-nosnippet>584</a> } |
| <a href=#585 id=585 data-nosnippet>585</a> |
| <a href=#586 id=586 data-nosnippet>586</a> <span class="comment">// FIXME: Emit the lint. |
| <a href=#587 id=587 data-nosnippet>587</a> </span>} |
| <a href=#588 id=588 data-nosnippet>588</a> |
| <a href=#589 id=589 data-nosnippet>589</a> <span class="kw">fn </span>upcast( |
| <a href=#590 id=590 data-nosnippet>590</a> <span class="kw-2">&</span><span class="self">self</span>, |
| <a href=#591 id=591 data-nosnippet>591</a> source_trait_ref: PolyTraitRef<<span class="lifetime">'db</span>>, |
| <a href=#592 id=592 data-nosnippet>592</a> target_trait_def_id: TraitId, |
| <a href=#593 id=593 data-nosnippet>593</a> ) -> PolyTraitRef<<span class="lifetime">'db</span>> { |
| <a href=#594 id=594 data-nosnippet>594</a> <span class="kw">let </span>upcast_trait_refs = |
| <a href=#595 id=595 data-nosnippet>595</a> upcast_choices(<span class="self">self</span>.interner(), source_trait_ref, target_trait_def_id); |
| <a href=#596 id=596 data-nosnippet>596</a> |
| <a href=#597 id=597 data-nosnippet>597</a> <span class="comment">// must be exactly one trait ref or we'd get an ambig error etc |
| <a href=#598 id=598 data-nosnippet>598</a> </span><span class="kw">if let </span><span class="kw-2">&</span>[upcast_trait_ref] = upcast_trait_refs.as_slice() { |
| <a href=#599 id=599 data-nosnippet>599</a> upcast_trait_ref |
| <a href=#600 id=600 data-nosnippet>600</a> } <span class="kw">else </span>{ |
| <a href=#601 id=601 data-nosnippet>601</a> Binder::dummy(TraitRef::new_from_args( |
| <a href=#602 id=602 data-nosnippet>602</a> <span class="self">self</span>.interner(), |
| <a href=#603 id=603 data-nosnippet>603</a> target_trait_def_id.into(), |
| <a href=#604 id=604 data-nosnippet>604</a> GenericArgs::error_for_item(<span class="self">self</span>.interner(), target_trait_def_id.into()), |
| <a href=#605 id=605 data-nosnippet>605</a> )) |
| <a href=#606 id=606 data-nosnippet>606</a> } |
| <a href=#607 id=607 data-nosnippet>607</a> } |
| <a href=#608 id=608 data-nosnippet>608</a> |
| <a href=#609 id=609 data-nosnippet>609</a> <span class="kw">fn </span>instantiate_binder_with_fresh_vars<T>(<span class="kw-2">&</span><span class="self">self</span>, value: Binder<<span class="lifetime">'db</span>, T>) -> T |
| <a href=#610 id=610 data-nosnippet>610</a> <span class="kw">where |
| <a href=#611 id=611 data-nosnippet>611</a> </span>T: TypeFoldable<DbInterner<<span class="lifetime">'db</span>>> + Copy, |
| <a href=#612 id=612 data-nosnippet>612</a> { |
| <a href=#613 id=613 data-nosnippet>613</a> <span class="self">self</span>.infcx().instantiate_binder_with_fresh_vars(BoundRegionConversionTime::FnCall, value) |
| <a href=#614 id=614 data-nosnippet>614</a> } |
| <a href=#615 id=615 data-nosnippet>615</a>} |
| </code></pre></div></section></main></body></html> |
