bjoernager/rust
bjoernager/rust
1
Fork 0
Code Issues Pull requests Activity

When checking whether an impl applies, constrain hidden types of opaque types.

Browse source 
We already handle this case this way on the coherence side, and it matches the new solver's behaviour. While there is some breakage around type-alias-impl-trait (see new "type annotations needed" in tests/ui/type-alias-impl-trait/issue-84660-unsoundness.rs), no stable code breaks, and no new stable code is accepted.
This commit is contained in:
Oli Scherer 2024-04-17 09:29:13 +00:00
parent dc8d1bc373
commit 29a630eb72
23 changed files with 126 additions and 115 deletions
Download patch file Download diff file Expand all files Collapse all files

2
compiler/rustc_trait_selection/src/traits/select/mod.rs
View file

@ -2539,7 +2539,7 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
let InferOk { obligations, .. } = self
.infcx
.at(&cause, obligation.param_env)
.eq(DefineOpaqueTypes::No, placeholder_obligation_trait_ref, impl_trait_ref)
.eq(DefineOpaqueTypes::Yes, placeholder_obligation_trait_ref, impl_trait_ref)
.map_err(|e| {
debug!("match_impl: failed eq_trait_refs due to `{}`", e.to_string(self.tcx()))
})?;