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+error[E0308]: mismatched types
+ --> $DIR/issue-102605.rs:13:20
+ |
+LL | convert_result(foo())
+ | -------------- ^^^^^ expected enum `Result`, found opaque type
+ | |
+ | arguments to this function are incorrect
+ |
+note: while checking the return type of the `async fn`
+ --> $DIR/issue-102605.rs:3:19
+ |
+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
+ |
+LL | fn convert_result<T, E>(r: Result<T, E>) -> Option<T> {
+ | ^^^^^^^^^^^^^^ ---------------
+help: consider `await`ing on the `Future`
+ |
+LL | convert_result(foo().await)
+ | ++++++
+help: try wrapping the expression in `Err`
+ |
+LL | convert_result(Err(foo()))
+ | ++++ +
+
+error[E0277]: `main` has invalid return type `Option<()>`
+ --> $DIR/issue-102605.rs:11:14
+ |
+LL | fn main() -> Option<()> {
+ | ^^^^^^^^^^ `main` can only return types that implement `Termination`
+ |
+ = 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`.