src/test/ui/error-codes/E0502.stderr

   1 error[E0502]: cannot borrow `*a` as mutable because `a` is also borrowed as immutable
   2   --> $DIR/E0502.rs:4:9
   3    |
   4 LL |     let ref y = a;
   5    |         ----- immutable borrow occurs here
   6 LL |     bar(a);
   7    |         ^ mutable borrow occurs here
   8 LL |     y.use_ref();
   9 LL | }
  10    | - immutable borrow ends here
  11
  12 error: aborting due to previous error
  13
  14 For more information about this error, try `rustc --explain E0502`.