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bug#8935: 24.0.50; `substitute-command-keys' doc

From: Drew Adams
Subject: bug#8935: 24.0.50; `substitute-command-keys' doc
Date: Fri, 15 Jul 2011 10:23:08 -0700

> > This is wrong, because \ by itself has no special meaning, 
> > so you don't need to precede it by \=.
> I see.  I thought it worked the normal way, in that "\e" would be "e".

It does.  That is correct.

Andreas was wrong in saying it is wrong.

What is true is that \ by itself (not followed by [, =, etc.) does not _NEED_ to
be escaped.  But it is certainly true that \= escapes \, whether it needs to in
any given context (e.g. \[) or not (e.g. \ abc).  If it escapes a \ that does
not need escaping, the effect is a no-op.

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