bug#13122: save-excursion not saving point

[Eli Zaretskii]

> From: Tino Calancha <tino.calancha@gmail.com>
> 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

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.