bug#15573: 24.3.50; `comment-end' in c mode

[Drew Adams]

> > There seems to be no good regexp variable to use, to search for the
> > end of a comment (e.g. in C mode, but therefore generally).
> 
> There can't be.  The syntax of the end of a comment depends on the
> comment-starter that was used.  So don't look for a regexp.  Look for
> a function instead, e.g. comment-forward.

Actually, that's what I have been using, `comment-search-forward' and
`comment-forward'.

> C also accepts //...\n

Right.  Forgot about that.

I still don't see why `comment-end' should not match "*/" without
a SPC preceding it.