1 error[E0004]: non-exhaustive patterns: `(X::A, Some(X::A))`, `(X::A, Some(X::B))`, `(X::B, Some(X::B))` and 2 more not covered
2 --> $DIR/issue-72377.rs:8:11
5 | ^^^^^^ patterns `(X::A, Some(X::A))`, `(X::A, Some(X::B))`, `(X::B, Some(X::B))` and 2 more not covered
7 = note: the matched value is of type `(X, Option<X>)`
8 help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern as shown, or multiple match arms
10 LL ~ (X::A, Some(X::C)) | (X::C, Some(X::A)) => false,
14 error: aborting due to previous error
16 For more information about this error, try `rustc --explain E0004`.