Paper over an accidental regression
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4 changed files with 24 additions and 15 deletions
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@ -461,7 +461,15 @@ fn check_opaque_meets_bounds<'tcx>(
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}
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match origin {
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// Checked when type checking the function containing them.
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hir::OpaqueTyOrigin::FnReturn(..) | hir::OpaqueTyOrigin::AsyncFn(..) => {}
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hir::OpaqueTyOrigin::FnReturn(..) | hir::OpaqueTyOrigin::AsyncFn(..) => {
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// HACK: this should also fall through to the hidden type check below, but the original
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// implementation had a bug where equivalent lifetimes are not identical. This caused us
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// to reject existing stable code that is otherwise completely fine. The real fix is to
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// compare the hidden types via our type equivalence/relation infra instead of doing an
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// identity check.
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let _ = infcx.take_opaque_types();
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return Ok(());
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}
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// Nested opaque types occur only in associated types:
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// ` type Opaque<T> = impl Trait<&'static T, AssocTy = impl Nested>; `
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// They can only be referenced as `<Opaque<T> as Trait<&'static T>>::AssocTy`.
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