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From: Raffaele Ricciardi <rfflrccrd@gmail.com>
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Subject: Re: `yank-and-mark` command?
Date: Mon, 6 Jul 2015 16:45:10 +0200
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On 06/07/15 15:50, Stefan Monnier wrote:
> Note that the call to exchange-point-and-mark is redundant.

Yet if I remove `exchange-point-and-mark', the command does not
work any longer.  Please compare the effects of the following
command:

(defun yank-and-mark/rr (&optional $arg)
   (interactive "*P")
   (yank $arg)
   (exchange-point-and-mark)
   (setq deactivate-mark nil))

with the same command, but without `exchange-point-and-mark'.

Tested in the "*scratch*" buffer, after "emacs -Q".  In
Fundamental Mode, too.