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Rollup merge of rust-lang#68498 - Aaron1011:tait-regression-tests, r=…
…Centril Add some type-alias-impl-trait regression tests Fixes rust-lang#57611 Fixes rust-lang#57807
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src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.rs
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// Regression test for issue #57611 | ||
// Ensures that we don't ICE | ||
// FIXME: This should compile, but it currently doesn't | ||
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#![feature(trait_alias)] | ||
#![feature(type_alias_impl_trait)] | ||
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trait Foo { | ||
type Bar: Baz<Self, Self>; | ||
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fn bar(&self) -> Self::Bar; | ||
} | ||
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struct X; | ||
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impl Foo for X { | ||
type Bar = impl Baz<Self, Self>; //~ ERROR type mismatch in closure arguments | ||
//~^ ERROR type mismatch resolving | ||
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fn bar(&self) -> Self::Bar { | ||
|x| x | ||
} | ||
} | ||
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trait Baz<A, B> = Fn(&A) -> &B; | ||
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fn main() {} |
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src/test/ui/type-alias-impl-trait/issue-57611-trait-alias.stderr
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error[E0631]: type mismatch in closure arguments | ||
--> $DIR/issue-57611-trait-alias.rs:17:5 | ||
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LL | type Bar = impl Baz<Self, Self>; | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected signature of `for<'r> fn(&'r X) -> _` | ||
... | ||
LL | |x| x | ||
| ----- found signature of `fn(_) -> _` | ||
| | ||
= note: the return type of a function must have a statically known size | ||
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error[E0271]: type mismatch resolving `for<'r> <[closure@$DIR/issue-57611-trait-alias.rs:21:9: 21:14] as std::ops::FnOnce<(&'r X,)>>::Output == &'r X` | ||
--> $DIR/issue-57611-trait-alias.rs:17:5 | ||
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LL | type Bar = impl Baz<Self, Self>; | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected bound lifetime parameter, found concrete lifetime | ||
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= note: the return type of a function must have a statically known size | ||
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error: aborting due to 2 previous errors | ||
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Some errors have detailed explanations: E0271, E0631. | ||
For more information about an error, try `rustc --explain E0271`. |
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src/test/ui/type-alias-impl-trait/issue-57807-associated-type.rs
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// Regression test for issue #57807 - ensure | ||
// that we properly unify associated types within | ||
// a type alias impl trait | ||
// check-pass | ||
#![feature(type_alias_impl_trait)] | ||
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trait Bar { | ||
type A; | ||
} | ||
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impl Bar for () { | ||
type A = (); | ||
} | ||
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trait Foo { | ||
type A; | ||
type B: Bar<A = Self::A>; | ||
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fn foo() -> Self::B; | ||
} | ||
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impl Foo for () { | ||
type A = (); | ||
type B = impl Bar<A = Self::A>; | ||
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fn foo() -> Self::B { | ||
() | ||
} | ||
} | ||
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fn main() {} |