2020-12-16 19:18:01 -06:00
error[E0004]: non-exhaustive patterns: `(None, None)` and `(Some(_), Some(_))` not covered
2020-12-16 18:42:49 -06:00
--> $DIR/issue-2111.rs:2:11
2018-07-15 16:11:54 -05:00
|
2020-12-16 18:42:49 -06:00
LL | match (a, b) {
2020-12-16 19:18:01 -06:00
| ^^^^^^ patterns `(None, None)` and `(Some(_), Some(_))` not covered
Point at enum definition when match patterns are not exhaustive
```
error[E0004]: non-exhaustive patterns: type `X` is non-empty
--> file.rs:9:11
|
1 | / enum X {
2 | | A,
| | - variant not covered
3 | | B,
| | - variant not covered
4 | | C,
| | - variant not covered
5 | | }
| |_- `X` defined here
...
9 | match x {
| ^
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `B` and `C` not covered
--> file.rs:11:11
|
1 | / enum X {
2 | | A,
3 | | B,
4 | | C,
| | - not covered
5 | | }
| |_- `X` defined here
...
11 | match x {
| ^ patterns `C` not covered
```
When a match expression doesn't have patterns covering every variant,
point at the enum's definition span. On a best effort basis, point at the
variant(s) that are missing. This does not handle the case when the missing
pattern is due to a field's enum variants:
```
enum E1 {
A,
B,
C,
}
enum E2 {
A(E1),
B,
}
fn foo() {
match E2::A(E1::A) {
E2::A(E1::B) => {}
E2::B => {}
}
//~^ ERROR `E2::A(E1::A)` and `E2::A(E1::C)` not handled
}
```
Unify look between match with no arms and match with some missing patterns.
Fix #37518.
2019-02-10 07:12:00 -06:00
|
2020-09-02 02:40:56 -05:00
= note: the matched value is of type `(Option<usize>, Option<usize>)`
2021-12-16 16:46:13 -06:00
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
2021-12-15 20:28:09 -06:00
|
LL ~ (Some(_), None) | (None, Some(_)) => {}
LL + (None, None) | (Some(_), Some(_)) => todo!()
|
2018-07-15 16:11:54 -05:00
error: aborting due to previous error
For more information about this error, try `rustc --explain E0004`.
