tests/ui/pattern/usefulness/issue-15129.rs

pub enum T {
    T1(()),
    T2(()),
}

pub enum V {
    V1(isize),
    V2(bool),
}

fn main() {
    match (T::T1(()), V::V2(true)) {
        //~^ ERROR non-exhaustive patterns: `(T::T1(()), V::V2(_))` and `(T::T2(()), V::V1(_))` not covered
        (T::T1(()), V::V1(i)) => (),
        (T::T2(()), V::V2(b)) => (),
    }
}