bug#25077: 25.1; Incorrect Edebug spec for c-lang-defvar

[Eli Zaretskii <eliz@gnu.org>]

> From: Gemini Lasswell <gazally@runbox.com>
> Date: Wed, 30 Nov 2016 11:20:28 -0800
> 
> The Edebug spec for c-lang-defvar doesn't allow for the use of
> 'dont-doc, which prevents the use of Edebug and Testcover on
> cc-langs.el.
> 
> To reproduce, using emacs -Q starting at the root of the Emacs
> sources:
> 
> M-: (require 'cc-langs) RET
> C-x C-f lisp/progmodes/cc-langs.el RET
> C-s dont-doc RET
> C-u C-M-x
> 
> Result: edebug-syntax-error: Invalid read syntax: stringp, "failed"
> 
> I tried this change to the Edebug spec for c-lang-defvar, and it makes
> Edebug work on all the c-lang-defvar uses in this file:
> 
> (def-edebug-spec c-lang-defvar
>   (&define name def-form &optional &or ("quote" "dont-doc") stringp))
>   
> Alternatively, the 'dont-doc could be removed from the 7 places it is
> used. The majority of c-lang-defvar calls simply omit the docstring,
> and the code in c-lang-defvar is not doing any checking for dont-doc,
> it simply ignores that parameter if it is not a string.

Alan, could you please look into this?

Thanks.