Fix unresolved type span inside async object

[csmoe]

Closes#65180
r? @estebank
cc @nikomatsakis@cramertj

[estebank]

Does this change have a user visible change?

[csmoe]

@estebank
From

error[E0698]: type inside `async` object must be known in this context
--> src/lib.rs:23:25
|
23 | let server = server.serve(hyper::service::make_service_fn(move |_| {
| ^^^^^ cannot infer type for `ME`
|
note: the type is part of the `async` object because of this `await`
--> src/lib.rs:34:5
|
34 | server.await
| ^^^^^^^^^^^^

To:

error[E0698]: type inside `async fn` body must be known in this context
--> src/lib.rs:15:13
|
15 | Ok(hyper::service::service_fn(move |req| {
| ^^ cannot infer type for `ME`
|
note: the type is part of the `async fn` body because of this `await`
--> src/lib.rs:24:5
|
24 | server.await
| ^^^^^^^^^^^^
error: aborting due to previous error

but I should figure out a test/ui.

[estebank]

r=me with a test

[nikomatsakis]

Looks good to me, too

[JohnCSimon]

Ping from triage.
@estebank can you please review this PR?
cc: @nikomatsakis@csmoe
Thank you!

[estebank]

@csmoe can you add a ui test exercising this new code?

[csmoe]

@estebank it's a bit complicated, still trying.

[JohnCSimon]

Ping from triage:
@csmoe How's it going with the UI test?
cc: @estebank
Thank you!

[bors]

☔ The latest upstream changes (presumably #66252) made this pull request unmergeable. Please resolve the merge conflicts.

[JohnCSimon]

Ping from triage:
@csmoe Can you please post your status regarding this PR, and address the merge conflicts?
cc: @estebank
Thank you!

[JohnCSimon]

Pinging once again from triage:
@csmoe Can you please post your status regarding this PR, and address the merge conflicts?

Thank you.

[JohnCSimon]

Triage:

@csmoe - unfortunately this PR has sat idle for several weeks, I'm marking this as inactive. Please reopen this PR when you're ready to move forward.
Thank you