1 error[E0004]: non-exhaustive patterns: `(None, None)` not covered
2 --> $DIR/issue-2111.rs:2:9
5 | ^^^^^ pattern `(None, None)` not covered
7 = help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
9 error: aborting due to previous error
11 For more information about this error, try `rustc --explain E0004`.