error[E0506]: cannot assign to `base` because it is borrowed
  --> $DIR/drop-in-loop.rs:18:9
   |
LL |     let mut wrapper = WrapperWithDrop(&mut base);
   |                                       --------- `base` is borrowed here
LL |     loop {
LL |         base = false;
   |         ^^^^^^^^^^^^ `base` is assigned to here but it was already borrowed
LL |         wrapper = WrapperWithDrop(&mut base);
   |         ------- borrow might be used here, when `wrapper` is dropped and runs the `Drop` code for type `WrapperWithDrop`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0506`.