error[E0308]: mismatched types
  --> $DIR/higher-ranked-auto-trait-1.rs:37:5
   |
LL | /     async {
LL | |         let _y = &();
LL | |         let _x = filter(FilterMap {
LL | |             f: || async move { *_y },
...  |
LL | |         drop(_x);
LL | |     }
   | |_____^ one type is more general than the other
   |
   = note: expected `async` block `{async block@$DIR/higher-ranked-auto-trait-1.rs:40:19: 40:29}`
              found `async` block `{async block@$DIR/higher-ranked-auto-trait-1.rs:40:19: 40:29}`
   = note: no two async blocks, even if identical, have the same type
   = help: consider pinning your async block and casting it to a trait object

error[E0308]: mismatched types
  --> $DIR/higher-ranked-auto-trait-1.rs:37:5
   |
LL | /     async {
LL | |         let _y = &();
LL | |         let _x = filter(FilterMap {
LL | |             f: || async move { *_y },
...  |
LL | |         drop(_x);
LL | |     }
   | |_____^ one type is more general than the other
   |
   = note: expected `async` block `{async block@$DIR/higher-ranked-auto-trait-1.rs:40:19: 40:29}`
              found `async` block `{async block@$DIR/higher-ranked-auto-trait-1.rs:40:19: 40:29}`
   = note: no two async blocks, even if identical, have the same type
   = help: consider pinning your async block and casting it to a trait object
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error: aborting due to 2 previous errors

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