eval(context, locals: Locals) {
   var evaluatedArgs = evalList(context, locals, this.args);
   if (this.receiver instanceof ImplicitReceiver && isPresent(locals) &&
                                    locals.contains(this.name)) {
     var fn = locals.get(this.name);
     return FunctionWrapper.apply(fn, evaluatedArgs);
   } else {
     var evaluatedReceiver = this.receiver.eval(context, locals);
     return this.fn(evaluatedReceiver, evaluatedArgs);
   }
 }

 _findOrCreate(key, binding, deps) {
   try {
     var instance = this.injector._getInstance(key);
     if (!_isWaiting(instance))
       return instance;
     return FunctionWrapper.apply(binding.factory, deps);
   } catch (e) {
       console.log("_findOrCreate", e.stack);
     this.injector._clear(key);
     throw new InstantiationError(e, key);
   }
 }

 execute(injector: Injector): void {
   var params = ListWrapper.map(this._tokens, (t) => injector.get(t));
   FunctionWrapper.apply(this._fn, params);
 }

 /**
  * Returns the value of the executed function.
  */
 execute(injector: Injector): any {
   var params = this._tokens.map(t => injector.get(t));
   return FunctionWrapper.apply(this._fn, params);
 }