error[E0502]: cannot borrow `s` as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-overloaded-index-ref-index.rs:62:22
   |
LL |     let rs = &mut s;
   |              ------ mutable borrow occurs here
LL |     println!("{}", f[&s]);
   |                      ^^ immutable borrow occurs here
...
LL |     drop(rs);
   |          -- borrow later used here

error[E0502]: cannot borrow `s` as immutable because it is also borrowed as mutable
  --> $DIR/borrowck-overloaded-index-ref-index.rs:65:7
   |
LL |     let rs = &mut s;
   |              ------ mutable borrow occurs here
...
LL |     f[&s] = 10;
   |       ^^ immutable borrow occurs here
...
LL |     drop(rs);
   |          -- borrow later used here

error[E0594]: cannot assign to data in a `&` reference
  --> $DIR/borrowck-overloaded-index-ref-index.rs:71:5
   |
LL |     s[2] = 20;
   |     ^^^^^^^^^ cannot assign

error: aborting due to 3 previous errors

Some errors occurred: E0502, E0594.
For more information about an error, try `rustc --explain E0502`.