text: function f(useArg2, arg2, expect) {
      var args = arguments;
      if (useArg2)
  	args = arg2;
  
      print(args)
      assertEq(args.length, expect);
  }
  
  // Generate a PIC for arguments.
  f(false, 0, 3);
  f(false, 0, 3);
  f(false, 0, 3);
  
  // Now call it with a slow array.
  var a = [1, 2, 3];
  a.x = 9;
  
  f(true, a, 3);
  