tail-rec-no-reassignment.js

function facRec2(_x2) {
  var _arguments = arguments;
  var _again = true;
  var __x2 = _x2;

  _function: while (_again) {
    var x = __x2;
    _again = false;
    var acc = _arguments.length <= 1 || _arguments[1] === undefined ? 1 : _arguments[1];

    if (x <= 1) {
      return acc;
    } else {
      _arguments = [__x2 = x - 1, x * acc];
      _again = true;
      acc = undefined;
      continue _function;
    }
  }
}