2018-08-08 14:28:26 +02:00
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error[E0004]: non-exhaustive patterns: `Err(_)` not covered
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2020-04-01 04:10:13 +03:00
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--> $DIR/uninhabited-matches-feature-gated.rs:6:19
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2018-08-08 14:28:26 +02:00
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2019-03-09 15:03:44 +03:00
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LL | let _ = match x {
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2018-08-08 14:28:26 +02:00
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| ^ pattern `Err(_)` not covered
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2021-06-10 13:52:00 +02:00
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2021-12-16 05:06:44 +00:00
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note: `Result<u32, &Void>` defined here
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--> $SRC_DIR/core/src/result.rs:LL:COL
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2022-12-12 15:25:04 +00:00
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::: $SRC_DIR/core/src/result.rs:LL:COL
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= note: not covered
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2021-01-28 18:01:36 +02:00
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= note: the matched value is of type `Result<u32, &Void>`
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2021-12-16 22:46:13 +00:00
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help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern or an explicit pattern as shown
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2021-12-16 02:14:17 +00:00
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LL ~ Ok(n) => n,
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LL ~ Err(_) => todo!(),
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2018-08-08 14:28:26 +02:00
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2018-11-20 21:48:13 +00:00
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error[E0004]: non-exhaustive patterns: type `&Void` is non-empty
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2020-04-01 04:10:13 +03:00
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--> $DIR/uninhabited-matches-feature-gated.rs:15:19
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2018-08-08 14:28:26 +02:00
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2019-03-09 15:03:44 +03:00
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LL | let _ = match x {};
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2018-08-08 14:28:26 +02:00
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| ^
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2021-12-16 05:06:44 +00:00
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note: `Void` defined here
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--> $DIR/uninhabited-matches-feature-gated.rs:2:6
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LL | enum Void {}
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| ^^^^
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2020-03-27 06:44:30 +01:00
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= note: the matched value is of type `&Void`
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2021-01-03 20:49:35 +01:00
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= note: references are always considered inhabited
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2021-12-16 22:46:13 +00:00
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help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern as shown
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2021-12-16 02:05:58 +00:00
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LL ~ let _ = match x {
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LL + _ => todo!(),
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LL ~ };
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2018-08-08 14:28:26 +02:00
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2018-11-20 21:48:13 +00:00
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error[E0004]: non-exhaustive patterns: type `(Void,)` is non-empty
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2020-04-01 04:10:13 +03:00
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--> $DIR/uninhabited-matches-feature-gated.rs:18:19
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2018-08-08 14:28:26 +02:00
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2019-03-09 15:03:44 +03:00
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LL | let _ = match x {};
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2018-08-08 14:28:26 +02:00
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| ^
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2020-03-27 06:44:30 +01:00
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= note: the matched value is of type `(Void,)`
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2021-12-16 22:46:13 +00:00
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help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern as shown
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2021-12-16 02:05:58 +00:00
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LL ~ let _ = match x {
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LL + _ => todo!(),
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LL ~ };
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2018-08-08 14:28:26 +02:00
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2018-11-20 21:48:13 +00:00
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error[E0004]: non-exhaustive patterns: type `[Void; 1]` is non-empty
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2020-04-01 04:10:13 +03:00
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--> $DIR/uninhabited-matches-feature-gated.rs:21:19
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2018-08-08 14:28:26 +02:00
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2019-03-09 15:03:44 +03:00
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LL | let _ = match x {};
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2018-08-08 14:28:26 +02:00
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| ^
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2020-03-27 06:44:30 +01:00
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= note: the matched value is of type `[Void; 1]`
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2021-12-16 22:46:13 +00:00
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help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern as shown
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2021-12-16 02:05:58 +00:00
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LL ~ let _ = match x {
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LL + _ => todo!(),
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LL ~ };
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2018-08-08 14:28:26 +02:00
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2019-11-03 23:11:04 +00:00
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error[E0004]: non-exhaustive patterns: `&[_, ..]` not covered
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2020-04-01 04:10:13 +03:00
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--> $DIR/uninhabited-matches-feature-gated.rs:24:19
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2018-08-08 14:28:26 +02:00
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2019-03-09 15:03:44 +03:00
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LL | let _ = match x {
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2019-11-03 23:11:04 +00:00
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| ^ pattern `&[_, ..]` 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 05:12:00 -08:00
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2020-03-27 06:44:30 +01:00
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= note: the matched value is of type `&[Void]`
|
2021-12-16 22:46:13 +00:00
|
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|
help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern or an explicit pattern as shown
|
2021-12-16 02:14:17 +00:00
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LL ~ &[] => (),
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LL ~ &[_, ..] => todo!(),
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2018-08-08 14:28:26 +02:00
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error[E0004]: non-exhaustive patterns: `Err(_)` not covered
|
2020-04-01 04:10:13 +03:00
|
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|
--> $DIR/uninhabited-matches-feature-gated.rs:32:19
|
2018-08-08 14:28:26 +02:00
|
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2019-03-09 15:03:44 +03:00
|
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LL | let _ = match x {
|
2018-08-08 14:28:26 +02:00
|
|
|
| ^ pattern `Err(_)` not covered
|
2021-06-10 13:52:00 +02:00
|
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|
2021-12-16 05:06:44 +00:00
|
|
|
note: `Result<u32, Void>` defined here
|
|
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|
--> $SRC_DIR/core/src/result.rs:LL:COL
|
2022-12-12 15:25:04 +00:00
|
|
|
::: $SRC_DIR/core/src/result.rs:LL:COL
|
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|
= note: not covered
|
2021-01-28 18:01:36 +02:00
|
|
|
= note: the matched value is of type `Result<u32, Void>`
|
2021-12-16 22:46:13 +00:00
|
|
|
help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern or an explicit pattern as shown
|
2021-12-16 02:14:17 +00:00
|
|
|
|
|
|
|
|
LL ~ Ok(x) => x,
|
|
|
|
LL ~ Err(_) => todo!(),
|
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|
2018-08-08 14:28:26 +02:00
|
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|
2022-12-23 21:02:23 +01:00
|
|
|
error[E0005]: refutable pattern in local binding
|
2020-04-01 04:10:13 +03:00
|
|
|
--> $DIR/uninhabited-matches-feature-gated.rs:37:9
|
2018-08-08 14:28:26 +02:00
|
|
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|
|
|
|
|
LL | let Ok(x) = x;
|
|
|
|
| ^^^^^ pattern `Err(_)` not covered
|
2021-06-10 13:52:00 +02:00
|
|
|
|
|
2019-10-09 12:25:48 -07:00
|
|
|
= note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
|
|
|
|
= note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
|
2021-01-28 18:01:36 +02:00
|
|
|
= note: the matched value is of type `Result<u32, Void>`
|
2022-12-23 22:23:37 +01:00
|
|
|
help: you might want to use `let else` to handle the variant that isn't matched
|
2019-10-09 12:25:48 -07:00
|
|
|
|
|
2022-03-08 05:54:38 +00:00
|
|
|
LL | let Ok(x) = x else { todo!() };
|
|
|
|
| ++++++++++++++++
|
2018-08-08 14:28:26 +02:00
|
|
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|
|
error: aborting due to 7 previous errors
|
|
|
|
|
2019-04-17 13:26:38 -04:00
|
|
|
Some errors have detailed explanations: E0004, E0005.
|
2018-08-08 14:28:26 +02:00
|
|
|
For more information about an error, try `rustc --explain E0004`.
|