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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Most of Elisp lacks lexical-binding: t
Date: Tue, 05 Feb 2019 05:31:59 +0200
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To: Stefan Monnier <monnier@IRO.UMontreal.CA>
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> From: Stefan Monnier <monnier@IRO.UMontreal.CA>
> Date: Mon, 04 Feb 2019 16:54:04 -0500
> Cc: emacs-devel@gnu.org
> 
> > The question is, though, at what point does it become the default?
> 
> IIUC Eli is not in a hurry to see it become the default.

I don't see how we could make this the default before we complete
converting all the Lisp files to lexical binding (or, unlikely, decide
that some of them need to use dynamic binding).  It would mean risking
a lot of breakage.