rust/tests/ui/traits/trivial_impl2.rs

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//! This test checks that we currently need to implement
//! members, even if their where bounds don't hold for the impl type.
trait Foo<T> {
fn foo()
where
Self: Foo<()>;
}
impl Foo<u32> for () {}
//~^ ERROR: not all trait items implemented, missing: `foo`
fn main() {}