src/test/ui/async-await/issue-98634.stderr

   1 error[E0271]: expected `fn() -> impl Future<Output = ()> {callback}` to be a fn item that returns `Pin<Box<(dyn Future<Output = ()> + 'static)>>`, but it returns `impl Future<Output = ()>`
   2   --> $DIR/issue-98634.rs:45:23
   3    |
   4 LL |         StructAsync { callback }.await;
   5    |                       ^^^^^^^^ expected struct `Pin`, found opaque type
   6    |
   7 note: while checking the return type of the `async fn`
   8   --> $DIR/issue-98634.rs:24:21
   9    |
  10 LL | async fn callback() {}
  11    |                     ^ checked the `Output` of this `async fn`, found opaque type
  12    = note:   expected struct `Pin<Box<(dyn Future<Output = ()> + 'static)>>`
  13            found opaque type `impl Future<Output = ()>`
  14 note: required by a bound in `StructAsync`
  15   --> $DIR/issue-98634.rs:9:35
  16    |
  17 LL | pub struct StructAsync<F: Fn() -> Pin<Box<dyn Future<Output = ()>>>> {
  18    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `StructAsync`
  19
  20 error[E0271]: expected `fn() -> impl Future<Output = ()> {callback}` to be a fn item that returns `Pin<Box<(dyn Future<Output = ()> + 'static)>>`, but it returns `impl Future<Output = ()>`
  21   --> $DIR/issue-98634.rs:45:9
  22    |
  23 LL |         StructAsync { callback }.await;
  24    |         ^^^^^^^^^^^^^^^^^^^^^^^^ expected struct `Pin`, found opaque type
  25    |
  26 note: while checking the return type of the `async fn`
  27   --> $DIR/issue-98634.rs:24:21
  28    |
  29 LL | async fn callback() {}
  30    |                     ^ checked the `Output` of this `async fn`, found opaque type
  31    = note:   expected struct `Pin<Box<(dyn Future<Output = ()> + 'static)>>`
  32            found opaque type `impl Future<Output = ()>`
  33 note: required by a bound in `StructAsync`
  34   --> $DIR/issue-98634.rs:9:35
  35    |
  36 LL | pub struct StructAsync<F: Fn() -> Pin<Box<dyn Future<Output = ()>>>> {
  37    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `StructAsync`
  38
  39 error[E0271]: expected `fn() -> impl Future<Output = ()> {callback}` to be a fn item that returns `Pin<Box<(dyn Future<Output = ()> + 'static)>>`, but it returns `impl Future<Output = ()>`
  40   --> $DIR/issue-98634.rs:45:33
  41    |
  42 LL |         StructAsync { callback }.await;
  43    |                                 ^^^^^^ expected struct `Pin`, found opaque type
  44    |
  45 note: while checking the return type of the `async fn`
  46   --> $DIR/issue-98634.rs:24:21
  47    |
  48 LL | async fn callback() {}
  49    |                     ^ checked the `Output` of this `async fn`, found opaque type
  50    = note:   expected struct `Pin<Box<(dyn Future<Output = ()> + 'static)>>`
  51            found opaque type `impl Future<Output = ()>`
  52 note: required by a bound in `StructAsync`
  53   --> $DIR/issue-98634.rs:9:35
  54    |
  55 LL | pub struct StructAsync<F: Fn() -> Pin<Box<dyn Future<Output = ()>>>> {
  56    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `StructAsync`
  57
  58 error: aborting due to 3 previous errors
  59
  60 For more information about this error, try `rustc --explain E0271`.