2017-10-06 16:30:23 -04:00
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error[E0004]: non-exhaustive patterns: `&[]` not covered
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2018-12-25 08:56:47 -07:00
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--> $DIR/slice.rs:6:11
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2017-10-06 16:30:23 -04:00
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2018-02-23 03:42:32 +03:00
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LL | match sl { //~ ERROR non-exhaustive patterns
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2017-10-06 16:30:23 -04:00
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| ^^ pattern `&[]` not covered
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Point at enum definition when match patterns are not exhaustive
```
error[E0004]: non-exhaustive patterns: type `X` is non-empty
--> file.rs:9:11
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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 {
| ^
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= 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
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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 05:12:00 -08:00
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= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
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2017-10-06 16:30:23 -04:00
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error: aborting due to previous error
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2018-03-03 15:59:40 +01:00
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For more information about this error, try `rustc --explain E0004`.
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