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error[E0277]: the `?` operator can only be applied to values that implement `Try`
--> $DIR/try-in-sync.rs:6:5
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LL | foo()?;
| ^^^^^^ the `?` operator cannot be applied to type `impl Future<Output = Result<(), ()>>`
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= help: the trait `Try` is not implemented for `impl Future<Output = Result<(), ()>>`
note: this implements `Future` and its output type supports `?`, but the future cannot be awaited in a synchronous function
--> $DIR/try-in-sync.rs:6:10
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LL | fn main() -> Result<(), ()> {
| --------------------------- this is not `async`
LL | foo()?;
| ^
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0277`.
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