<'
extend sys {
  !x1: int;
  x2: uint (bits: 3);
  !x3: int [10..100];
  run() is also { 
    print x1;
    print x2;
    print x3;
    x1 = x2; 
    x3 = x1;
    var x:
    int (bits: 48) = x3;
    print x1;
    print x2;
    print x3;
  };
}; 

'>