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Matthias Krüger
e0f4dc955a
taint fcx on selection errors during unsizing With `feature(dyn_compatible_for_dispatch)` we only check for dyn-compatibility by checking the `T: Unsize<dyn Trait>` predicate during the unsizing coercions checks. If the predicate doesn't hold, we emit an error, but pretend the coercion succeeded to prevent further errors. To prevent const eval from attempting to actually perform this coercion, we need to taint the fcx after reporting the trait errors in the coercion check. fixes https://github.com/rust-lang/rust/issues/135021 fixes https://github.com/rust-lang/rust/issues/130521