error[E0502]: cannot borrow `my_stuff` as mutable because it is also borrowed as immutable
  --> $DIR/hashmap-iter-value-lifetime.rs:7:5
   |
LL |     let (_, thing) = my_stuff.iter().next().unwrap();
   |                      --------------- immutable borrow occurs here
LL |
LL |     my_stuff.clear();
   |     ^^^^^^^^^^^^^^^^ mutable borrow occurs here
LL |
LL |     println!("{}", *thing);
   |                    ------ immutable borrow later used here

error: aborting due to previous error

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