| 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,) as From<[T; 1]>> |
| <(T, T) as From<[T; 2]>> |
| <(T, T, T) as From<[T; 3]>> |
| <(T, T, T, T) as From<[T; 4]>> |
| <(T, T, T, T, T) as From<[T; 5]>> |
| <(T, T, T, T, T, T) as From<[T; 6]>> |
| <(T, T, T, T, T, T, T) as From<[T; 7]>> |
| <(T, T, T, T, T, T, T, T) as From<[T; 8]>> |
| 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`. |
