tests/ui/generic-associated-types/issue-67510.rs

trait X {
    type Y<'a>;
}

fn f(x: Box<dyn X<Y<'a> = &'a ()>>) {}
//~^ ERROR: use of undeclared lifetime name `'a`
//~| ERROR: use of undeclared lifetime name `'a`
//~| ERROR: the trait `X` is not dyn compatible [E0038]

fn main() {}