anchor.diff:    Engine engine;
     Injector injector;
   
  -  Car(Engine this.engine, Injector this.injector);
  +  Car(this.engine, this.injector);
   }
   
   class NumDependency {
  
positive.code: 
  
      it('should inject injector into factory function', () {
        var module = new Module();
        module.type(Engine);
        module.factory(Car, (Injector injector) {
          return new Car(injector.get(Engine), injector);
        });
  
  
negative.code: 
    it('should do value binding', () {
      var engine = new MockEngine();
      var module = new Module()..value(Engine, engine);
  
      var binding = module.bindings[Engine];
      expect(binding, isNotNull);
  