Treat TAIT equation as always ambiguous in coherence #112780
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Some changes occurred in src/tools/clippy cc @rust-lang/clippy |
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Jun 18, 2023
| @@ -32,10 +32,4 @@ impl Into<u8> for ContainsVal { | |||
| } | |||
| } | |||
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| type Opaque = impl Sized; | |||
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Removed this example because it shouldn't pass coherence.
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Treat TAIT equation as always ambiguous in coherence Not sure why we weren't treating all TAIT equality as ambiguous -- this behavior combined with `DefineOpaqueTypes::No` leads to coherence overlap failures, since we incorrectly consider impls as not overlapping because the obligation `T: From<Foo>` doesn't hold. Fixes rust-lang#112765
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…iaskrgr Rollup of 7 pull requests Successful merges: - rust-lang#109970 ([doc] `poll_fn`: explain how to `pin` captured state safely) - rust-lang#112705 (Simplify `Span::source_callee` impl) - rust-lang#112757 (Use BorrowFlag instead of explicit isize) - rust-lang#112768 (Rewrite various resolve/diagnostics errors as translatable diagnostics) - rust-lang#112777 (Continue folding in query normalizer on weak aliases) - rust-lang#112780 (Treat TAIT equation as always ambiguous in coherence) - rust-lang#112783 (Don't ICE on bound var in `reject_fn_ptr_impls`) r? `@ghost` `@rustbot` modify labels: rollup
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Not sure why we weren't treating all TAIT equality as ambiguous -- this behavior combined with
DefineOpaqueTypes::Noleads to coherence overlap failures, since we incorrectly consider impls as not overlapping because the obligationT: From<Foo>doesn't hold.Fixes #112765