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bug#13122: save-excursion not saving point


From: Tino Calancha
Subject: bug#13122: save-excursion not saving point
Date: Sat, 27 Apr 2019 16:44:52 +0900 (JST)
User-agent: Alpine 2.20 (DEB 67 2015-01-07)



On Sat, 27 Apr 2019, Eli Zaretskii wrote:

From: Tino Calancha <address@hidden>
Date: Sat, 27 Apr 2019 04:53:56 +0900

;; Following expression should eval as non-nil
(let ((pos 3))
  (with-temp-buffer
    (insert "abcdef")
    (goto-char pos)
    (save-excursion (transpose-chars 2))
    (= pos (point))))
=> nil

I read that warning; maybe getting `nil' is above is expected; if that's the case then we can close the report again.

The reason why I shared the above snippet is because Chong applied a patch
(commit: aa26f345096166bd8c135876dbab9b671ae232e3)
to fix the original recipe:
a call to `traspose-chars' inside a `save-excursion' moving the point if the argument is n != 1.

Why did you think it should evaluate to non-nil?  The ELisp manual has
a warning near the end of description of save-excursion; I think it's
relevant to this use case.





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