bug#36566: 27.0.50; debug is sometimes horribly slow

[Lars Ingebrigtsen]

I've now finished the implementation and pushed to the trunk.  It's not
really that relevant to this discussion since we're using cl-prin1
anyway, but anyway.

I wondered whether to keep the mapping variable all on the C side.  I
marked print--variable-mapping as a constant, but somebody may just
setcdr it anyway, so it's not really constant in any meaningful way, and
users shouldn't modify it.  But I thought it might be vaguely useful to
be able to inspect that variable so that it's less mysterious what's
happening.

But writing this, I think I'm changing my mind, and I think I may remove
that DEFVAR_LISP...  Hm.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no