src/test/ui/try-on-option.stderr

   1 error[E0277]: `?` couldn't convert the error to `()`
   2   --> $DIR/try-on-option.rs:7:6
   3    |
   4 LL |     x?;
   5    |      ^ the trait `std::convert::From<std::option::NoneError>` is not implemented for `()`
   6    |
   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`
   9 help: consider converting the `Option<T>` into a `Result<T, _>` using `Option::ok_or` or `Option::ok_or_else`
  10    |
  11 LL |     x.ok_or_else(|| /* error value */)?;
  12    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  13
  14 error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `std::ops::Try`)
  15   --> $DIR/try-on-option.rs:13:5
  16    |
  17 LL | / fn bar() -> u32 {
  18 LL | |     let x: Option<u32> = None;
  19 LL | |     x?;
  20    | |     ^^ cannot use the `?` operator in a function that returns `u32`
  21 LL | |     22
  22 LL | | }
  23    | |_- this function should return `Result` or `Option` to accept `?`
  24    |
  25    = help: the trait `std::ops::Try` is not implemented for `u32`
  26    = note: required by `std::ops::Try::from_error`
  27
  28 error: aborting due to 2 previous errors
  29
  30 For more information about this error, try `rustc --explain E0277`.