src/test/ui/nll/issue-48803.rs

   1 fn flatten<'a, 'b, T>(x: &'a &'b T) -> &'a T {
   2     x
   3 }
   4
   5 fn main() {
   6     let mut x = "original";
   7     let y = &x;
   8     let z = &y;
   9     let w = flatten(z);
  10     x = "modified";
  11     //~^ ERROR cannot assign to `x` because it is borrowed [E0506]
  12     println!("{}", w); // prints "modified"
  13 }