error[E0499]: cannot borrow `void` as mutable more than once at a time
  --> $DIR/mut-borrow-outside-loop.rs:7:18
   |
LL |     let first = &mut void;
   |                 --------- first mutable borrow occurs here
LL |     let second = &mut void;
   |                  ^^^^^^^^^ second mutable borrow occurs here
LL |     first.use_mut();
   |     --------------- first borrow later used here

error[E0499]: cannot borrow `inner_void` as mutable more than once at a time
  --> $DIR/mut-borrow-outside-loop.rs:15:28
   |
LL |         let inner_first = &mut inner_void;
   |                           --------------- first mutable borrow occurs here
LL |         let inner_second = &mut inner_void;
   |                            ^^^^^^^^^^^^^^^ second mutable borrow occurs here
LL |         inner_second.use_mut();
LL |         inner_first.use_mut();
   |         --------------------- first borrow later used here

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0499`.