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error[E0308]: mismatched types
--> $DIR/issue-102605.rs:13:20
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LL | convert_result(foo())
| -------------- ^^^^^ expected enum `Result`, found opaque type
| |
| arguments to this function are incorrect
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note: while checking the return type of the `async fn`
--> $DIR/issue-102605.rs:3:19
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LL | async fn foo() -> Result<(), String> {
| ^^^^^^^^^^^^^^^^^^ checked the `Output` of this `async fn`, found opaque type
= note: expected enum `Result<(), _>`
found opaque type `impl Future<Output = Result<(), String>>`
note: function defined here
--> $DIR/issue-102605.rs:7:4
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LL | fn convert_result<T, E>(r: Result<T, E>) -> Option<T> {
| ^^^^^^^^^^^^^^ ---------------
help: consider `await`ing on the `Future`
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LL | convert_result(foo().await)
| ++++++
help: try wrapping the expression in `Err`
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LL | convert_result(Err(foo()))
| ++++ +
error[E0277]: `main` has invalid return type `Option<()>`
--> $DIR/issue-102605.rs:11:14
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LL | fn main() -> Option<()> {
| ^^^^^^^^^^ `main` can only return types that implement `Termination`
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= help: consider using `()`, or a `Result`
error: aborting due to 2 previous errors
Some errors have detailed explanations: E0277, E0308.
For more information about an error, try `rustc --explain E0277`.
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