bug#7496: 23.2; copy recursive keymap cause crash

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> What happens in the current master without that limitation?  We have
> since added stack overflow protection -- doesn't it kick in in this
> case?

No, Emacs just crashes hard.  I haven't examined why, though -- I didn't
know about the new stack overflow protection.

It's easy to reproduce, though: Just eval this form and Emacs will
segfault (if it's older than yesterday's):

(let ((map (make-sparse-keymap)))
  (define-key map " " map)
  (copy-keymap map))

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