1 error[E0277]: `?` couldn't convert the error to `()`
2 --> $DIR/try-on-option.rs:7:6
5 | ^ the trait `std::convert::From<std::option::NoneError>` is not implemented for `()`
7 = note: the question mark operation (`?`) implicitly performs a conversion on the error value using the `From` trait
8 = note: required by `std::convert::From::from`
10 error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `std::ops::Try`)
11 --> $DIR/try-on-option.rs:13:5
14 | ^^ cannot use the `?` operator in a function that returns `u32`
16 = help: the trait `std::ops::Try` is not implemented for `u32`
17 = note: required by `std::ops::Try::from_error`
19 error: aborting due to 2 previous errors
21 For more information about this error, try `rustc --explain E0277`.