36 lines
1.4 KiB
Plaintext
36 lines
1.4 KiB
Plaintext
error[E0277]: `?` couldn't convert the error to `()`
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--> $DIR/option-to-result.rs:5:6
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LL | fn test_result() -> Result<(),()> {
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| ------------- expected `()` because of this
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LL | let a:Option<()> = Some(());
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LL | a?;
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| ^ the trait `From<NoneError>` is not implemented for `()`
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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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= note: required by `from`
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help: consider converting the `Option<T>` into a `Result<T, _>` using `Option::ok_or` or `Option::ok_or_else`
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LL | a.ok_or_else(|| /* error value */)?;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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error[E0277]: `?` couldn't convert the error to `NoneError`
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--> $DIR/option-to-result.rs:11:6
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LL | fn test_option() -> Option<i32>{
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| ----------- expected `NoneError` because of this
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LL | let a:Result<i32, i32> = Ok(5);
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LL | a?;
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| ^ the trait `From<i32>` is not implemented for `NoneError`
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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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= note: required by `from`
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help: consider converting the `Result<T, _>` into an `Option<T>` using `Result::ok`
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LL | a.ok()?;
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| ^^^^^
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error: aborting due to 2 previous errors
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For more information about this error, try `rustc --explain E0277`.
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