error[E0502]: cannot borrow `t0` as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-swap-mut-base-ptr.rs:13:10
   |
LL |     let p: &isize = &*t0;     // Freezes `*t0`
   |                     ---- immutable borrow occurs here
LL |     swap(&mut t0, &mut t1);
   |          ^^^^^^^ mutable borrow occurs here
LL |     *t1 = 22;
LL |     p.use_ref();
   |     - immutable borrow later used here

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0502`.