rust/src/test/compile-fail/or-patter-mismatch.rs

// error-pattern: mismatched types

tag blah {
    a(int, int, uint);
    b(int, int);
}

fn main() {
    alt a(1, 1, 2u) {
        a(_, ?x, ?y) | b(?x, ?y) { }
    }
}