2018-08-08 12:28:26 +00:00
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error[E0005]: refutable pattern in local binding: `T(_, _)` not covered
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2019-12-11 14:51:28 +00:00
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--> $DIR/empty-never-array.rs:10:9
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2018-08-08 12:28:26 +00:00
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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 13:12:00 +00:00
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LL | / enum Helper<T, U> {
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LL | | T(T, [!; 0]),
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2019-09-09 14:44:06 +00:00
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| | - 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 13:12:00 +00:00
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LL | | #[allow(dead_code)]
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LL | | U(U),
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LL | | }
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| |_- `Helper<T, U>` defined here
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...
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LL | let Helper::U(u) = Helper::T(t, []);
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| ^^^^^^^^^^^^ pattern `T(_, _)` not covered
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2019-10-09 19:25:48 +00:00
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= note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
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= note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
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2020-03-27 05:44:30 +00:00
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= note: the matched value is of type `Helper<T, U>`
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2019-10-09 19:25:48 +00:00
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help: you might want to use `if let` to ignore the variant that isn't matched
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LL | if let Helper::U(u) = Helper::T(t, []) { /* */ }
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2018-08-08 12:28:26 +00:00
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2019-12-27 17:53:00 +00:00
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error: aborting due to previous error
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2018-08-08 12:28:26 +00:00
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2019-12-27 17:53:00 +00:00
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For more information about this error, try `rustc --explain E0005`.
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