rust/src/test/run-pass/writealias.rs

// -*- rust -*-

type point = rec(int x, int y, mutable int z);

fn f(& mutable point p) {
  p.z = 13;
}

fn main() {
  let point x = rec(x=10, y=11, mutable z=12);
  f(x);
  assert (x.z == 13);
}