tests/ui/borrowck/borrowck-pat-reassign-binding.rs

   1 fn main() {
   2     let mut x: Option<isize> = None;
   3     match x {
   4       None => {
   5           // Note: on this branch, no borrow has occurred.
   6           x = Some(0);
   7       }
   8       Some(ref i) => {
   9           // But on this branch, `i` is an outstanding borrow
  10           x = Some(*i+1); //~ ERROR cannot assign to `x` because it is borrowed
  11           drop(i);
  12       }
  13     }
  14     x.clone(); // just to prevent liveness warnings
  15 }