error[E0499]: cannot borrow `**other` as mutable more than once at a time
  --> $DIR/issue-46589.rs:29:21
   |
LL |         *other = match (*other).get_self() {
   |                        -------- first mutable borrow occurs here
LL |             Some(s) => s,
LL |             None => (*other).new_self()
   |                     ^^^^^^^^
   |                     |
   |                     second mutable borrow occurs here
   |                     first borrow later used here

error[E0505]: cannot move out of `other` because it is borrowed
  --> $DIR/issue-46589.rs:33:17
   |
LL |         *other = match (*other).get_self() {
   |                        -------- borrow of `**other` occurs here
...
LL |         let c = other;
   |                 ^^^^^
   |                 |
   |                 move out of `other` occurs here
   |                 borrow later used here

error: aborting due to 2 previous errors

Some errors occurred: E0499, E0505.
For more information about an error, try `rustc --explain E0499`.