GNU bug report logs - #17257
24.3.90; ediff causes "Wrong type argument: listp, [#<overlay ...> ...]" error

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Ivan Shmakov <ivan <at> siamics.net>
Subject: bug#17259: closed (Re: bug#17257: 24.3.90; ediff causes "Wrong
 type argument: listp, [#<overlay ...> ...]" error)
Date: Mon, 14 Apr 2014 02:25:04 +0000

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Your bug report

#17257: ediff-set-fine-diff-properties-in-one-buffer uses dolist on a vector?

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 17259 <at> debbugs.gnu.org.

-- 
17257: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=17257
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: YAMAMOTO Mitsuharu <mituharu <at> math.s.chiba-u.ac.jp>
To: 17257-done <at> debbugs.gnu.org
Subject: Re: bug#17257: 24.3.90;
 ediff causes "Wrong type argument: listp, [#<overlay ...> ...]" error
Date: Mon, 14 Apr 2014 11:24:19 +0900

Version: 24.4

>>>>> On Sun, 13 Apr 2014 22:05:50 -0400, Stefan Monnier <monnier <at> IRO.UMontreal.CA> said:

>> The value of `fine-diff-vector' was a vector of overlays, so dolist
>> couldn't be applied to it.

> Duh!  Sorry!  I shouldn't have replaced mapcar with dolist but with
> mapc.  Feel free to beat me to it,

Done.  Closing.

				     YAMAMOTO Mitsuharu
				mituharu <at> math.s.chiba-u.ac.jp

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From: Ivan Shmakov <ivan <at> siamics.net>
To: submit <at> debbugs.gnu.org
Subject: ediff-set-fine-diff-properties-in-one-buffer uses dolist on a vector?
Date: Sun, 13 Apr 2014 09:54:13 +0000

Package:  emacs

	In edce85e3 [1], ediff-set-fine-diff-properties-in-one-buffer
	was edited to use dolist (was: mapcar) to iterate over the
	fine-diff-vector local variable, resulting now in errors like:

Debugger entered--Lisp error: (wrong-type-argument listp [#<overlay from 1210 to 1210 in  *XXX*> #<overlay from 1220 to 1269 in  *YYY*>])
  ediff-set-fine-diff-properties-in-one-buffer(A 0 nil)
  ediff-set-fine-diff-properties(0)
  ediff-make-fine-diffs(0 noforce)
  ediff-install-fine-diff-if-necessary(0)
  ediff-next-difference(1)
  call-interactively(ediff-next-difference nil nil)
  command-execute(ediff-next-difference)

	Replacing dolist with an equivalent mapc invocation has fixed
	the issue for me.

	If, OTOH, dolist is actually /supposed/ to work on non-list
	sequences, I’d like to suggest updating its documentation, which
	currently reads:

(defmacro dolist (spec &rest body)
  "Loop over a list.
Evaluate BODY with VAR bound to each car from LIST, in turn.
Then evaluate RESULT to get return value, default nil.

\(fn (VAR LIST [RESULT]) BODY...)"
  …)

[1] http://git.savannah.gnu.org/cgit/emacs.git/commit/lisp/vc/ediff-diff.el?h=emacs-24&id=edce85e3a164a57da09c564c4f2a8edc8f009df1

-- 
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