svoid las_profileForToWithAndWithoutReturnValue() {
  int n = 100000;
  S src = "for i to \*n*/ { i }";
  var script1 = leftArrowParse(src);
  var script2 = leftArrowParse(src + "; null");
  
  profileFor5(-> script1!);
  
  benchFor1("with return value", -> script1!);
  benchFor5("w/o  return value", -> script2!);
}