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Auto merge of #111161 - compiler-errors:rtn-super, r=cjgillot

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Support return-type bounds on associated methods from supertraits

Support `T: Trait<method(): Bound>` when `method` comes from a supertrait, aligning it with the behavior of associated type bounds (both equality and trait bounds).

The only wrinkle is that I have to extend `super_predicates_that_define_assoc_type` to look for *all* items, not just `AssocKind::Ty`. This will also be needed to support `feature(associated_const_equality)` as well, which is subtly broken when it comes to supertraits, though this PR does not fix those yet. There's a slight chance there's a perf regression here, in which case I guess I could split it out into a separate query.
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bors 2023-05-07 11:18:22 +00:00
commit 0dddad0dc5
17 changed files with 210 additions and 50 deletions
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6
compiler/rustc_hir_analysis/messages.ftl
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@ -192,7 +192,11 @@ hir_analysis_return_type_notation_equality_bound =
return type notation is not allowed to use type equality
hir_analysis_return_type_notation_missing_method =
cannot find associated function `{$assoc_name}` in trait `{$trait_name}`
cannot find associated function `{$assoc_name}` for `{$ty_name}`
hir_analysis_return_type_notation_conflicting_bound =
ambiguous associated function `{$assoc_name}` for `{$ty_name}`
.note = `{$assoc_name}` is declared in two supertraits: `{$first_bound}` and `{$second_bound}`
hir_analysis_placeholder_not_allowed_item_signatures = the placeholder `_` is not allowed within types on item signatures for {$kind}
.label = not allowed in type signatures