error[E0505]: cannot move out of `pi` because it is borrowed
  --> tests/ui/move_iref_parsing_input.rs:16:10
   |
10 |     let mut pi = ParsingInput::new(Box::new(input), |iref| async move { iref }.boxed_local());
   |         ------ binding `pi` declared here
...
14 |     let iref = pi.result_mut();
   |                -- borrow of `pi` occurs here
15 |
16 |     drop(pi);
   |          ^^ move out of `pi` occurs here
17 |
18 |     iref;
   |     ---- borrow later used here