error[E0623]: lifetime mismatch
  --> $DIR/regions-reborrow-from-shorter-mut-ref-mut-ref.rs:4:5
   |
LL | fn copy_borrowed_ptr<'a, 'b, 'c>(p: &'a mut &'b mut &'c mut isize) -> &'b mut isize {
   |                                     -----------------------------     -------------
   |                                     |
   |                                     this parameter and the return type are declared with different lifetimes...
LL |     &mut ***p
   |     ^^^^^^^^^ ...but data from `p` is returned here

error: aborting due to previous error