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error[E0277]: `?` couldn't convert the error to `()`
--> $DIR/try-on-option.rs:7:6
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LL | x?;
| ^ the trait `std::convert::From<std::option::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
= note: required by `std::convert::From::from`
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
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LL | x?;
| ^^ cannot use the `?` operator in a function that returns `u32`
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= 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`.
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