src/test/ui/hashmap/hashmap-lifetimes.stderr

   1 error[E0502]: cannot borrow `my_stuff` as mutable because it is also borrowed as immutable
   2   --> $DIR/hashmap-lifetimes.rs:6:5
   3    |
   4 LL |     let mut it = my_stuff.iter();
   5    |                  -------- immutable borrow occurs here
   6 LL |     my_stuff.insert(1, 43);
   7    |     ^^^^^^^^^^^^^^^^^^^^^^ mutable borrow occurs here
   8 LL |     it;
   9    |     -- immutable borrow later used here
  10
  11 error: aborting due to previous error
  12
  13 For more information about this error, try `rustc --explain E0502`.