Re: gnus-agentize versus emacs 20 mapc

[Kevin Greiner <kgreiner@xpediantsolutions.com>]

Katsumi Yamaoka <yamaoka@jpl.org> writes:

>>>>>> In <87oev1uyzw.fsf@zip.com.au>
>>>>>>	Kevin Ryde <user42@zip.com.au> wrote:
>
>> I tried to startup today's cvs under emacs 20 but it died in
>> gnus-agentize, apparently missing mapc
>
>>     Signaling: (void-function mapc)
>
> [...]
>
>> Does one have to require 'cl to use mapc, not just eval-when-compile?
>> I'm not up with the way that stuff is supposed to work.

Macros can be evaluated during compilation as they get expanded by
the compiler.  However, functions such as mapc must be evaluated at
runtime.

>> If gnus-agentize is only iterating over a few methods then perhaps
>> just mapcar would be enough.
>
> I have the same opinion with you.  Developers, if you think Gnus
> still supports Emacs 20, please do so.  Or should I add the
> compiler macro to dgnushack.el for `mapc'?

The mapc function currently appears in 
  gnus-agent.el
  gnus-registry.el
  gnus.el
  spam-stat.el
  spam.el
so it would appear that multiple authors have made the same mistake.
Rather than perpetuate the issue, I'd vote for the compiler macro in
dgnushack.el.  Can someone who uses Emacs 20 write and test it?

Kevin