bjoernager/rust
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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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compiler/rustc_trait_selection/src/traits/mod.rs
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@ -62,7 +62,7 @@ pub use self::util::elaborate;
pub use self::util::{expand_trait_aliases, TraitAliasExpander};
pub use self::util::{get_vtable_index_of_object_method, impl_item_is_final, upcast_choices};
pub use self::util::{
supertrait_def_ids, supertraits, transitive_bounds, transitive_bounds_that_define_assoc_type,
supertrait_def_ids, supertraits, transitive_bounds, transitive_bounds_that_define_assoc_item,
SupertraitDefIds,
};