text: //// [collisionThisExpressionAndLocalVarInLambda.ts]
  declare function alert(message?: any): void;
  
  var x = {
      doStuff: (callback) => () => {
          var _this = 2;
          return callback(this);
      }
  }
  alert(x.doStuff(x => alert(x)));
  
  //// [collisionThisExpressionAndLocalVarInLambda.js]
  var _this_1 = this;
  var x = {
      doStuff: function (callback) { return function () {
          var _this = 2;
          return callback(_this_1);
      }; }
  };
  alert(x.doStuff(function (x) { return alert(x); }));
  