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