rust/tests/ui/type-alias-impl-trait/impl_trait_in_trait_defined...

23 lines
422 B
Rust

//! Check that we cannot instantiate a hidden type from another assoc type.
#![feature(impl_trait_in_assoc_type)]
trait Trait: Sized {
type Assoc;
type Foo;
fn foo() -> Self::Assoc;
}
impl Trait for () {
type Assoc = impl std::fmt::Debug;
type Foo = [(); {
let x: Self::Assoc = 42; //~ ERROR: mismatched types
3
}];
fn foo() -> Self::Assoc {
""
}
}
fn main() {}