Re: A little more regex.h pedantry

[Karl Berry]

    deprecate the manual setting of those particular fields, 

As I recall, Kathy and I wrote all that based on actual usage (Emacs was
the main thing we looked at).  I am not in favor of "deprecating"
anything that has been around so long, precisely because it has been
around so long.  What is gained?  I hope something besides pedantic
cleanliness.

    paticular, `fastmap' can't be set (you have to call
    re_compile_fastmap, and `no_sub' can't be set (because re_compile
    always overwrites it, as it does newline_anchor).

I certainly can't remember the state of the code 18 years ago, but
simply based on the above quote of what we wrote, I expect that it was
true at the time that fastmap and no_sub could be set.  We wouldn't have
written it otherwise.  So someone broke that in the meantime.  Obviously
life went on.

BTW, if you look for "xx" in regex.texi, you'll see more things that we
didn't finish back then.  And as far as importing it wholesale, I'd be
amazed if the RE_ bit settings and API functions haven't changed (been
added to, at least) since then.

karl