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Auto merge of #117610 - compiler-errors:object-hmm, r=aliemjay
Only instantiate binder during dyn's built-in trait candidate probe once See UI test for demonstration of the issue. This was "caused" by #117131, but only because we're using the `normalize_param_env` (which has been augmented with a projection clause used to normalize GATs) which features non-lifetime bound vars in it. Fixes #117602 technically, though that's also fixed by #117542. r? types
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tests/ui/traits/non-lifetime-via-dyn-builtin.current.stderr
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warning: the feature `non_lifetime_binders` is incomplete and may not be safe to use and/or cause compiler crashes | ||
--> $DIR/non-lifetime-via-dyn-builtin.rs:5:12 | ||
| | ||
LL | #![feature(non_lifetime_binders)] | ||
| ^^^^^^^^^^^^^^^^^^^^ | ||
| | ||
= note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information | ||
= note: `#[warn(incomplete_features)]` on by default | ||
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warning: 1 warning emitted | ||
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warning: the feature `non_lifetime_binders` is incomplete and may not be safe to use and/or cause compiler crashes | ||
--> $DIR/non-lifetime-via-dyn-builtin.rs:5:12 | ||
| | ||
LL | #![feature(non_lifetime_binders)] | ||
| ^^^^^^^^^^^^^^^^^^^^ | ||
| | ||
= note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information | ||
= note: `#[warn(incomplete_features)]` on by default | ||
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warning: 1 warning emitted | ||
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// revisions: current next | ||
//[next] compile-flags: -Ztrait-solver=next | ||
// check-pass | ||
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#![feature(non_lifetime_binders)] | ||
//~^ WARN the feature `non_lifetime_binders` is incomplete and may not be safe | ||
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fn trivial<A>() | ||
where | ||
for<B> dyn Fn(A, *const B): Fn(A, *const B), | ||
{ | ||
} | ||
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fn main() { | ||
trivial::<u8>(); | ||
} |
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tests/ui/traits/non_lifetime_binders/disqualifying-object-candidates.rs
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// check-pass | ||
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trait Foo { | ||
type Bar<T> | ||
where | ||
dyn Send + 'static: Send; | ||
} | ||
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impl Foo for () { | ||
type Bar<T> = i32; | ||
// We take `<() as Foo>::Bar<T>: Sized` and normalize it under the where clause | ||
// of `for<S> <() as Foo>::Bar<S> = i32`. This gives us back `i32: Send` with | ||
// the nested obligation `(dyn Send + 'static): Send`. However, during candidate | ||
// assembly for object types, we disqualify any obligations that has non-region | ||
// late-bound vars in the param env(!), rather than just the predicate. This causes | ||
// the where clause to not hold even though it trivially should. | ||
} | ||
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fn main() {} |