error[E0277]: the `?` operator can only be used in an async block that returns `Result` or `Option` (or another type that implements `Try`)
  --> $DIR/try-on-option-in-async.rs:8:9
   |
LL |       async {
   |  ___________-
LL | |         let x: Option<u32> = None;
LL | |         x?;
   | |         ^^ cannot use the `?` operator in an async block that returns `{integer}`
LL | |         22
LL | |     }
   | |_____- this function should return `Result` or `Option` to accept `?`
   |
   = help: the trait `Try` is not implemented for `{integer}`
   = note: required by `from_error`

error[E0277]: the `?` operator can only be used in an async closure that returns `Result` or `Option` (or another type that implements `Try`)
  --> $DIR/try-on-option-in-async.rs:17:9
   |
LL |       let async_closure = async || {
   |  __________________________________-
LL | |         let x: Option<u32> = None;
LL | |         x?;
   | |         ^^ cannot use the `?` operator in an async closure that returns `u32`
LL | |         22_u32
LL | |     };
   | |_____- this function should return `Result` or `Option` to accept `?`
   |
   = help: the trait `Try` is not implemented for `u32`
   = note: required by `from_error`

error[E0277]: the `?` operator can only be used in an async function that returns `Result` or `Option` (or another type that implements `Try`)
  --> $DIR/try-on-option-in-async.rs:26:5
   |
LL |   async fn an_async_function() -> u32 {
   |  _____________________________________-
LL | |     let x: Option<u32> = None;
LL | |     x?;
   | |     ^^ cannot use the `?` operator in an async function that returns `u32`
LL | |     22
LL | | }
   | |_- this function should return `Result` or `Option` to accept `?`
   |
   = help: the trait `Try` is not implemented for `u32`
   = note: required by `from_error`

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0277`.