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#![feature(type_alias_impl_trait)]
type A = impl Foo;
type B = impl Foo;
trait Foo {}
fn muh(x: A) -> B {
if false {
return x; // B's hidden type is A (opaquely)
//~^ ERROR opaque type's hidden type cannot be another opaque type
}
Bar // A's hidden type is `Bar`, because all the return types are compared with each other
}
struct Bar;
impl Foo for Bar {}
fn main() {}
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