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From: "Richard M. Stallman" <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: define key with "\s-" super modifier in string?
Date: Thu, 08 Dec 2005 14:29:25 -0500
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	    (global-set-key "\s-n" 'compile)

	    Debugger entered--Lisp error: (error "Key sequence SPC - n uses invalid prefix characters")
	    ...

The presence of SPC in the error message is certainly a bug.

The main purpose of \s for space is for character constants.
So it seems to be a mistake to treat \s as space in string constants
even when followed by dash.  It should get an error at read time.
I made a change to do that.