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+error[E0277]: the `?` operator can only be used in an async block that returns `Result` or `Option` (or another type that implements `FromResidual`)
+ --> $DIR/try-on-option-in-async.rs:8:10
+ |
+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 `FromResidual<Option<Infallible>>` is not implemented for `{integer}`
+
+error[E0277]: the `?` operator can only be used in an async closure that returns `Result` or `Option` (or another type that implements `FromResidual`)
+ --> $DIR/try-on-option-in-async.rs:17:10
+ |
+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 `FromResidual<Option<Infallible>>` is not implemented for `u32`
+
+error[E0277]: the `?` operator can only be used in an async function that returns `Result` or `Option` (or another type that implements `FromResidual`)
+ --> $DIR/try-on-option-in-async.rs:26:6
+ |
+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 `FromResidual<Option<Infallible>>` is not implemented for `u32`
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0277`.