<'
struct a { 
  !m: int; 
  m1: int; 
  post_generate() is also { 
    m = m1 + 1; 
  }; 
}; 
extend sys { 
  A: a; 
  run() is also {
    for {var i : uint = 0; i < 4; i = i +1} do {
      gen A;
      print A;
    };
  };
}; 
'>