src/test/ui/specialization/defaultimpl/specialization-wfcheck.rs

// Tests that a default impl still has to have a WF trait ref.

#![feature(specialization)]

trait Foo<'a, T: Eq + 'a> { }

default impl<U> Foo<'static, U> for () {}
//~^ ERROR the trait bound `U: std::cmp::Eq` is not satisfied

fn main(){}