error[E0308]: mismatched types
  --> $DIR/suggest-missing-await-closure.rs:16:18
   |
LL |         take_u32(x)
   |                  ^
   |                  |
   |                  expected u32, found opaque type
   |                  help: consider using `.await` here: `x.await`
   |
   = note: expected type `u32`
              found type `impl std::future::Future`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.