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bug#17236: undo-only hangs when nils double up


From: Stefan Monnier
Subject: bug#17236: undo-only hangs when nils double up
Date: Thu, 10 Apr 2014 16:30:21 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux)

> Is this an Emacs bug or an Evil bug?

Putting a double nil in the undo-list is an error, so Evil is to blame.
But that doesn't excuse the inf-loop.  We should check with `eq' that we
don't add an identity mapping to undo-equiv-table.


        Stefan





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