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Add tcx.visible_traits() and use it for producing diagnostics

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Add an alternative to `tcx.all_traits()` that only shows traits that the
user might be able to use, for diagnostic purposes. With this available,
make use of it for diagnostics including associated type errors, which
is part of the problem with [1].

Includes a few comment updates for related API.

[1]: https://github.com/rust-lang/rust/issues/135232
This commit is contained in:
Trevor Gross 2025-01-13 04:44:58 +00:00
parent 9c34253762
commit 2da9accab9
5 changed files with 23 additions and 4 deletions
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2
compiler/rustc_trait_selection/src/error_reporting/traits/fulfillment_errors.rs
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@ -2189,7 +2189,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
let required_trait_path = self.tcx.def_path_str(trait_ref.def_id());
let traits_with_same_path: UnordSet<_> = self
.tcx
.all_traits()
.visible_traits()
.filter(|trait_def_id| *trait_def_id != trait_ref.def_id())
.map(|trait_def_id| (self.tcx.def_path_str(trait_def_id), trait_def_id))
.filter(|(p, _)| *p == required_trait_path)