how to find what features/options added between releases?

[Rob Austein]

At Wed, 13 Jun 2007 16:59:43 +1000, Mark Andrews wrote:
> 
> > > 	Also see the output of
> > > 
> > > 	perl util/new-func ../9.4.x/CHANGES ../9.3.x/CHANGES
> > > 
> > > 	and
> > > 
> > > 	perl util/new-func ../9.3.x/CHANGES ../9.2.x/CHANGES
> > 
> > Does this work? It doesn't show anything for me.
> 
> 	If you get the order of the CHANGES wrong you won't get
> 	anything.

If that's easily detectable it'd be nice to whine about it rather than
doing nothing.  If not, oh well.