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Deleting overlays from killed buffer

From: Dmitry Antipov
Subject: Deleting overlays from killed buffer
Date: Thu, 11 Oct 2012 17:45:39 +0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:16.0) Gecko/20121005 Thunderbird/16.0 
There is a very critical error (as seen in 110507):

buffer.c:885: Emacs fatal error: assertion failed: BUFFERP (Fmarker_buffer 
(ov->start))

To reproduce:

emacs -Q
(make-overlay 10 20)      ; Staying in *scratch*
(setq B (current-buffer)) ; Save *scratch* in B
(kill-buffer)             ; Kill *scratch*
(delete-all-overlays B)   ; Attempt to delete overlays from killed buffer

Dmitry
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