src/test/ui/traits/check-trait-object-bounds-5.rs

// Check that we validate associated type bounds on super traits for trait
// objects

trait Is {
    type T;
}

impl<U> Is for U {
    type T = U;
}

trait Super {
    type V;
}

trait Obj: Super {
    type U: Is<T = Self::V>;
}

fn is_obj<T: ?Sized + Obj>(_: &T) {}

fn f(x: &dyn Obj<U = i32, V = i64>) {
    is_obj(x)
    //~^ type mismatch resolving `<i32 as Is>::T == i64`
}

fn main() {}