src/test/ui/unboxed-closures/unboxed-closures-borrow-conflict.rs

   1 // Test that an unboxed closure that mutates a free variable will
   2 // cause borrow conflicts.
   3
   4
   5
   6 fn main() {
   7     let mut x = 0;
   8     let f = || x += 1;
   9     let _y = x; //~ ERROR cannot use `x` because it was mutably borrowed
  10     f;
  11 }