mirror of
https://github.com/rust-lang/rust
synced 2024-10-14 04:23:37 +00:00
27 lines
1.3 KiB
Plaintext
27 lines
1.3 KiB
Plaintext
error[E0277]: `?` couldn't convert the error to `()`
|
|
--> $DIR/issue-32709.rs:4:11
|
|
|
|
|
LL | fn a() -> Result<i32, ()> {
|
|
| --------------- expected `()` because of this
|
|
LL | Err(5)?;
|
|
| ------^ the trait `From<{integer}>` is not implemented for `()`, which is required by `Result<i32, ()>: FromResidual<Result<Infallible, {integer}>>`
|
|
| |
|
|
| this can't be annotated with `?` because it has type `Result<_, {integer}>`
|
|
|
|
|
= note: the question mark operation (`?`) implicitly performs a conversion on the error value using the `From` trait
|
|
= help: the following other types implement trait `From<T>`:
|
|
`(T, T)` implements `From<[T; 2]>`
|
|
`(T, T, T)` implements `From<[T; 3]>`
|
|
`(T, T, T, T)` implements `From<[T; 4]>`
|
|
`(T, T, T, T, T)` implements `From<[T; 5]>`
|
|
`(T, T, T, T, T, T)` implements `From<[T; 6]>`
|
|
`(T, T, T, T, T, T, T)` implements `From<[T; 7]>`
|
|
`(T, T, T, T, T, T, T, T)` implements `From<[T; 8]>`
|
|
`(T, T, T, T, T, T, T, T, T)` implements `From<[T; 9]>`
|
|
and 4 others
|
|
= note: required for `Result<i32, ()>` to implement `FromResidual<Result<Infallible, {integer}>>`
|
|
|
|
error: aborting due to 1 previous error
|
|
|
|
For more information about this error, try `rustc --explain E0277`.
|