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#[derive(PartialEq, Eq)]
enum X { A, B, C, }
fn main() {
let x = X::A;
let y = Some(X::A);
match (x, y) {
//~^ ERROR non-exhaustive patterns: `(A, Some(A))`, `(A, Some(B))`, `(B, Some(B))` and 2
//~| more not covered
(_, None) => false,
(v, Some(w)) if v == w => true,
(X::B, Some(X::C)) => false,
(X::B, Some(X::A)) => false,
(X::A, Some(X::C)) | (X::C, Some(X::A)) => false,
};
}
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