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error[E0004]: non-exhaustive patterns: `(None, None)` and `(Some(_), Some(_))` not covered
--> $DIR/issue-2111.rs:2:11
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LL | match (a, b) {
| ^^^^^^ patterns `(None, None)` and `(Some(_), Some(_))` not covered
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= note: the matched value is of type `(Option<usize>, Option<usize>)`
help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern, a match arm with multiple or-patterns as shown, or multiple match arms
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LL ~ (Some(_), None) | (None, Some(_)) => {},
LL + (None, None) | (Some(_), Some(_)) => todo!()
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error: aborting due to previous error
For more information about this error, try `rustc --explain E0004`.
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