warning: unused generator that must be used
  --> $DIR/issue-48623-generator.rs:15:5
   |
LL |     move || { d; yield; &mut *r };
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(unused_must_use)]` on by default
   = note: generators are lazy and do nothing unless resumed

warning: 1 warning emitted