Re: Registry warning?

[Ted Zlatanov <tzz@lifelogs.com>]

On Wed, 28 Sep 2011 09:29:33 +0200 David Engster <deng@randomsample.de> wrote: 

DE> Ted Zlatanov writes:
>> On Sun, 04 Sep 2011 23:01:43 +0200 David Engster <deng@randomsample.de> wrote: 
>> 
DE> Dave Goldberg writes:
>>>> ~/.gnus/registry.eioio seems to be persistent - that is the file
>>>> doesn't get removed when I exit so I don't understand what might be
>>>> wrong with it when it wants to reload.
>> 
DE> The persistence of the registry depends on (featurep
DE> 'hashtable-print-readable), which is available on FSF Emacs >=23.2. Gnus
DE> should probably say something more meaningful on older Emacsen...
>> 
>> I thought EIEIO had its own persistence mechanism, not using
>> `hashtable-print-readable'?  That was one of the reasons I switched to
>> it, so serialization would Just Work.

DE> No. If you look in your mails somewhere around May, you'll see I wrote
DE> this to you when discussing ERT tests on Emacs 22. EIEIO cannot
DE> magically save any LISP structure (what about recursive structures, for
DE> example?). It uses prin1 and hopes for the best, but you can provide
DE> your own printer in the ':printer' slot.

Thanks for repeating the information, I either forgot or misunderstood
it.  So can we provide a custom printer for Emacs 23.1 and older?

Ted