Vue.js version

2.0.1

Reproduction Link

https://jsfiddle.net/x3k60w7c/

Steps to reproduce

Just run the demo

What is Expected?

Default slot fallback
[inner]

What is actually happening?

[inner]
Named slot fallback

inner should replace the <slot name="abc"> part of outer, but instead it replaces the <slot> part. Seems its slot attribute is not working.
It works fine if functional: true, is deleted (line 15). So is functional component not supposed to be a named slot of another component or am I using it wrong?