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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.help
Subject: Re: C-[ is undefined
Date: Fri, 27 Jul 2018 16:38:54 -0400
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> This seems to work correctly, though I can't say I entirely understand why:
>
> (define-key key-translation-map
>   (vector (+ #x4000000 ?\[))
>   [?\e])

Looks like a bug in `event-apply-modifier`:

   (event-apply-modifier ?a 'control 26 "C-")

correctly returns 1 (aka C-a) but it doesn't apply that same
special-case to ?\[


        Stefan