bug#19346: 25.0.50; url-http-parse-headers: Symbol's function definition is void: gnutls-available-p

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: hi@yagnesh.org,  19346@debbugs.gnu.org,  larsi@gnus.org
> Date: Fri, 12 Dec 2014 16:56:50 -0500
> 
> > Yes, libraries will need to advertise more than one feature.
> 
> Maybe.  Quite likely they can DEFUN or not DEFUN depending on the
> presence of those features, so the client packages will simply use
> fboundp checks, as they do when checking the features of an
> Elisp library.

How harder would it be if 'foo-available-p', or 'require', or 'load',
or whatever we call it, would return a list of the features supported
by the module?