rust/tests/ui/traits/trivial_impl.rs

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