src/test/ui/type-alias-impl-trait/different_defining_uses_never_type.rs

#![feature(type_alias_impl_trait)]

fn main() {}

// two definitions with different types
type Foo = impl std::fmt::Debug;

fn foo() -> Foo {
    ""
}

fn bar() -> Foo { //~ ERROR concrete type differs from previous
    panic!()
}

fn boo() -> Foo { //~ ERROR concrete type differs from previous
    loop {}
}