src/test/ui/async-await/try-on-option-in-async.stderr

   1 error[E0277]: the `?` operator can only be used in an async block that returns `Result` or `Option` (or another type that implements `FromResidual`)
   2   --> $DIR/try-on-option-in-async.rs:8:10
   3    |
   4 LL | /     async {
   5 LL | |         let x: Option<u32> = None;
   6 LL | |         x?;
   7    | |          ^ cannot use the `?` operator in an async block that returns `{integer}`
   8 LL | |         22
   9 LL | |     }
  10    | |_____- this function should return `Result` or `Option` to accept `?`
  11    |
  12    = help: the trait `FromResidual<Option<Infallible>>` is not implemented for `{integer}`
  13
  14 error[E0277]: the `?` operator can only be used in an async closure that returns `Result` or `Option` (or another type that implements `FromResidual`)
  15   --> $DIR/try-on-option-in-async.rs:17:10
  16    |
  17 LL |       let async_closure = async || {
  18    |  __________________________________-
  19 LL | |         let x: Option<u32> = None;
  20 LL | |         x?;
  21    | |          ^ cannot use the `?` operator in an async closure that returns `u32`
  22 LL | |         22_u32
  23 LL | |     };
  24    | |_____- this function should return `Result` or `Option` to accept `?`
  25    |
  26    = help: the trait `FromResidual<Option<Infallible>>` is not implemented for `u32`
  27
  28 error[E0277]: the `?` operator can only be used in an async function that returns `Result` or `Option` (or another type that implements `FromResidual`)
  29   --> $DIR/try-on-option-in-async.rs:26:6
  30    |
  31 LL |   async fn an_async_function() -> u32 {
  32    |  _____________________________________-
  33 LL | |     let x: Option<u32> = None;
  34 LL | |     x?;
  35    | |      ^ cannot use the `?` operator in an async function that returns `u32`
  36 LL | |     22
  37 LL | | }
  38    | |_- this function should return `Result` or `Option` to accept `?`
  39    |
  40    = help: the trait `FromResidual<Option<Infallible>>` is not implemented for `u32`
  41
  42 error: aborting due to 3 previous errors
  43
  44 For more information about this error, try `rustc --explain E0277`.