| 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-diagnostics.rs:7:5 |
| | |
| LL | / fn a_function() -> 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[E0277]: the `?` operator can only be used in a closure that returns `Result` or `Option` (or another type that implements `std::ops::Try`) |
| --> $DIR/try-on-option-diagnostics.rs:14:9 |
| | |
| LL | let a_closure = || { |
| | _____________________- |
| LL | | let x: Option<u32> = None; |
| LL | | x?; |
| | | ^^ cannot use the `?` operator in a closure that returns `{integer}` |
| LL | | 22 |
| LL | | }; |
| | |_____- this function should return `Result` or `Option` to accept `?` |
| | |
| = help: the trait `std::ops::Try` is not implemented for `{integer}` |
| = 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`. |