error[E0506]: cannot assign to `*y.pointer` because it is borrowed
  --> $DIR/borrowck-assign-to-andmut-in-borrowed-loc.rs:28:9
   |
LL |         let z = copy_borrowed_ptr(&mut y);
   |                                        - borrow of `*y.pointer` occurs here
LL |         *y.pointer += 1; //~ ERROR cannot assign
   |         ^^^^^^^^^^^^^^^ assignment to borrowed `*y.pointer` occurs here

error: aborting due to previous error

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