Built-In Component component's prop IS can not receive async component factory function

[changchengqin]

Version

2.4.2

Steps to reproduce

1.Use Built-in Component : component

<script src="https://unpkg.com/vue"></script>

<div id="app">
  <p>{{ message }}</p>
  <component></component>
</div>

2.Declare a method called getAsyncComponent in Vue methods block that return an asynchronous component factory function

new Vue({
  el: '#app',
  data: {
    message: 'Hello Vue.js!'
  },
  methods:{
    getAsyncComponent() {
      return () => Promise.resolve({
        template: `<p>Hello</p>`
      })
    }
  }
})

3.Call getAsyncComponent for component's is attribute

<script src="https://unpkg.com/vue"></script>

<div id="app">
  <p>{{ message }}</p>
  <component :is="getAsyncComponent()"></component>
</div>

What is expected?

doesn't render async component

What is actually happening?

The getAsyncComponet method will enter the dead loop call

[posva]

It does work: https://jsfiddle.net/bn6904gz/