bug#4835: 23.1; Improper `Invalid face reference' messages. Performance degraded.

[Chong Yidong]

"Drew Adams" <drew.adams@oracle.com> writes:

> You haven't given one reason why this should be limited to a symbol. Show why
> `functionp' is problematic, and you might have an argument.

I'm afraid I don't have time to wade through the sea of words, but I've
stated that it would be nice if a lambda expression can be used.  But I
doubt it's worthwhile to change this for 23.2.  Assuming there's no
third-party code relying on using a lambda expression (which does not
work properly), for now we should simply document the case that works.