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From: Gregory Heytings via "Emacs development discussions." <emacs-devel@gnu.org>
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Subject: Re: elisp--local-variables triggers an error on special input
Date: Tue, 01 Dec 2020 14:42:33 +0000
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>> You get that error by just eval'ing:
>>
>>     (insert "((eg \"\C-,\")")
>>
>> in the *scratch* buffer.
>
> Hm. I don't. The string just gets inserted:
>
>  ((eg "C-,")
>
> (as I'd expected).
>

You should get an "Invalid modifier in string" error, at least that's what 
you get with emacs -Q.  The \C-, is not valid.  ASCII characters 0x00 to 
0x3E are not allowed after \C, with the exception of \0x20 (space).  That 
includes the comma, colon, semicolong, digits, ...