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// revisions: current next
//[next] compile-flags: -Znext-solver
#![feature(type_alias_impl_trait)]
type A = impl Foo; //[current]~ ERROR unconstrained opaque type
type B = impl Foo;
trait Foo {}
fn muh(x: A) -> B {
x // B's hidden type is A (opaquely)
//[current]~^ ERROR opaque type's hidden type cannot be another opaque type
//[next]~^^ ERROR type annotations needed: cannot satisfy `A <: B`
}
struct Bar;
impl Foo for Bar {}
fn main() {}
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