rust/tests/ui/specialization/min_specialization/impl-on-opaque2.rs

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// Test that specializing on opaque types is allowed
#![feature(min_specialization, type_alias_impl_trait)]
trait SpecTrait<U, V> {
fn f();
}
impl<U> SpecTrait<U, ()> for () {
default fn f() {}
}
type Opaque = impl Tuple;
trait Tuple {}
impl Tuple for () {}
// FIXME: this passes if we use `<(), ()>` here instead of `<(), Opaque>`,
// even though there can't be more overlap from the opaque version
impl SpecTrait<(), Opaque> for () {
//~^ ERROR: conflicting implementations
fn f() {}
}
fn foo() -> Opaque {}
fn main() {}