error[E0502]: cannot borrow `p` as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-assign-comp-idx.rs:22:5
   |
LL |     let q: &isize = &p[0];
   |                      - immutable borrow occurs here
LL | 
LL |     p[0] = 5; //~ ERROR cannot borrow
   |     ^ mutable borrow occurs here
...
LL | }
   | - immutable borrow ends here

error[E0502]: cannot borrow `p` as mutable because it is also borrowed as immutable
  --> $DIR/borrowck-assign-comp-idx.rs:37:9
   |
LL |         &p,
   |          - immutable borrow occurs here
LL |         || p[0] = 5); //~ ERROR cannot borrow `p` as mutable
   |         ^^ -       - immutable borrow ends here
   |         |  |
   |         |  borrow occurs due to use of `p` in closure
   |         mutable borrow occurs here

error: aborting due to 2 previous errors

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