Version

2.4.2

Reproduction link

https://jsfiddle.net/2pbthd1v/

Steps to reproduce

When calling createElement, pass a function that returns a promise which resolves to a Vue options bag.

For example:

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

var options = {
  template: '<div id="replacement">Hello!!</div>',
}

new Vue({
  el: "#app",
  render(h) {
    return h(() => new Promise(r => r(options)));
  }
});

What is expected?

Either something useful or an error message.

What is actually happening?

The entire page stops responding.

This was part of the .d.ts test suite. I wanted to see if a test case was legitimate, but I ended up finding that it triggers some sort of bad behavior.