var func = fun(){
  var ret = 0;
  for (var i = 0; i < 1000000; ++i) {
    ret += i;
  }
  return ret;
}


var fut1 := async(func);
var fut2 := async(func);
var fut3 := async(func);
var fut4 := async(func);

// simply executing without crashing is good enough for this test

print(" ${fut1.get()} ${fut2.get()} ${fut3.get()} ${fut4.get()}")