blob: 33ca58bf7feb17e366cf284b0d5bb98216d63069 [file] [log] [blame]
error[E0277]: `?` couldn't convert the error to `()`
--> $DIR/try-on-option.rs:7:6
|
LL | fn foo() -> Result<u32, ()> {
| --------------- expected `()` because of this
LL | let x: Option<u32> = None;
LL | x?;
| ^ the trait `std::convert::From<std::option::NoneError>` is not implemented for `()`
|
= note: the question mark operation (`?`) implicitly performs a conversion on the error value using the `From` trait
= note: required by `std::convert::From::from`
help: consider converting the `Option<T>` into a `Result<T, _>` using `Option::ok_or` or `Option::ok_or_else`
|
LL | x.ok_or_else(|| /* error value */)?;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `std::ops::Try`)
--> $DIR/try-on-option.rs:13:5
|
LL | / fn bar() -> u32 {
LL | | let x: Option<u32> = None;
LL | | x?;
| | ^^ cannot use the `?` operator in a function that returns `u32`
LL | | 22
LL | | }
| |_- this function should return `Result` or `Option` to accept `?`
|
= help: the trait `std::ops::Try` is not implemented for `u32`
= note: required by `std::ops::Try::from_error`
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0277`.