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