text: function _classCallCheck(instance, Constructor) {
      if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
  }
  var C = function() {
      "use strict";
      _classCallCheck(this, C);
  }, C2 = function() {
      "use strict";
      _classCallCheck(this, C2);
  }, D = function() {
      "use strict";
      _classCallCheck(this, D);
  };
  