error[E0507]: cannot move out of `*owner` which is behind a mutable reference
  --> tests/compile_fail/moving_cell_owner.rs:35:37
   |
35 |     let v = DerefDrop { ptr, owner: *owner };
   |                                     ^^^^^^ move occurs because `*owner` has type `dreck::Owner<'_>`, which does not implement the `Copy` trait