error[E0573]: expected type, found variant `Ok`
  --> $DIR/issue-106062.rs:15:64
   |
LL |     async fn connection_handler(handler: impl Sized) -> Result<Ok, std::io::Error> {
   |                                                                ^^ not a type
   |
help: try using the variant's enum
   |
LL |     async fn connection_handler(handler: impl Sized) -> Result<core::result::Result, std::io::Error> {
   |                                                                ~~~~~~~~~~~~~~~~~~~~
LL |     async fn connection_handler(handler: impl Sized) -> Result<std::result::Result, std::io::Error> {
   |                                                                ~~~~~~~~~~~~~~~~~~~

error: aborting due to previous error

For more information about this error, try `rustc --explain E0573`.