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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Message's text-properties in *Messages* (was: edebug: regrettable
	loss of information in Emacs 26.1 when printing a variable's value)
Date: Wed, 23 May 2018 20:22:11 +0300
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Wed, 23 May 2018 12:03:45 -0400
> 
> - Why would arbitrary Lisp code be dangerous (I understand that message_dolog
>   can be called from within redisplay, but redisplay runs Elisp code
>   at several places, so "from redidplay" doesn't inherently imply you
>   can't run Elisp code).

When Lisp code is called from redisplay, we always do that via
safe_call.  Anything else is not safe, AFAIR.