bug#23053: 25.0.92; error in cc-mode when editing C# file with a generic class inheritance

[Alan Mackenzie]

Hello, Saulius.

In article <mailman.7741.1458315553.843.bug-gnu-emacs@gnu.org> you wrote:

> When writing code:

> namespace X
> {
>     public class A: B<T>
>     {$
> ($ above denotes cursor position)

> Typing [Enter] after the second { would trigger this error:

> Debugger entered--Lisp error: (wrong-type-argument stringp nil)
>   signal(wrong-type-argument (stringp nil))
>   c-syntactic-re-search-forward(nil nil t t)
>   c-forward-<>-arglist-recur(nil)
>   c-forward-<>-arglist(nil)
>   c-backward-<>-arglist(nil nil)
>   c-looking-at-decl-block(13 t)
>   c-guess-basic-syntax()
>   c-indent-line()
>   indent-according-to-mode()
>   evil-open-below(1)
>   funcall-interactively(evil-open-below 1)
>   call-interactively(evil-open-below nil nil)
>   command-execute(evil-open-below)

> Note, that typing [Enter] after non-generic class inheritance would work ok 
> (no error would get triggered):

> namespace X
> {
>     public class A: B
>     {$

> I *think* it could be related to this commit (will test):
>     commit 02b037b85ce32fdcf454f5b12d72f09bcb217891
>     Author: Alan Mackenzie <acm@muc.de>
>     Date:   Mon Feb 15 12:45:42 2016 +0000

>         Allow arithmetic operators inside C++ template constructs.

Thanks for such an informative bug report.  Could you possibly tell me
what major mode you're using (presumably some C# Mode) and where I can
get a copy of it from, please.  That will enable me to reproduce the
problem.


> In GNU Emacs 25.0.92.3 (x86_64-apple-darwin15.3.0, NS appkit-1404.34 Version 
> 10.11.3 (Build 15D21))
>  of 2016-03-17 built on mbp.local
> Repository revision: 9ab03f27fad7b1ae68dda7a2effd075658dcf184
> Windowing system distributor 'Apple', version 10.3.1404
> Configured using:
>  'configure --with-gnutls --with-ns'

> Configured features:
> JPEG DBUS NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS

> Important settings:
>   value of $LANG: de_LT
>   locale-coding-system: utf-8

> Major mode: mu4e-headers

???

Thanks in advance!

-- 
Alan Mackenzie (Nuremberg, Germany).