int[] f(int[] x, int[] y, bool b) {
  if ( b ) {
    return x;
  } else {
    return y;
  }
}

global x = new int[]{1, 2, 3};
global y = new int[]{4, 5, 6};


int program (int argc, string[] argv) {
  f(x, y, true)[0] = 17;
  return x[0];
}