bug#63323: c-ts-mode does not know about `restrict'

[Eli Zaretskii]

> Cc: 63323@debbugs.gnu.org
> Date: Sat, 06 May 2023 13:31:03 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> 
> It looks like c-ts-mode thinks type qualifiers are possible only in
> C++?
> 
>    :feature 'type
>    `((primitive_type) @font-lock-type-face
>      (type_identifier) @font-lock-type-face
>      (sized_type_specifier) @font-lock-type-face
>      ,@(when (eq mode 'cpp) <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
>          '((type_qualifier) @font-lock-type-face
> 
>            (qualified_identifier
>             scope: (namespace_identifier) @font-lock-type-face)
> 
>            (operator_cast) type: (type_identifier) @font-lock-type-face))
>      [,@c-ts-mode--type-keywords] @font-lock-type-face)
> 
> The tree-sitter library returns a type_qualifier node for 'restrict':
> 
>        (parameter_declaration type: (type_identifier)
>       declarator: 
>        (pointer_declarator *
>         (type_qualifier restrict)
>         declarator: (identifier)))
> 
> Yuan, can you look into fixing this, please?

Actually, it looks like we recognize the type qualifiers in C as
keywords, via a separate list.  So I've just added to that list the
two missing qualifiers: 'restrict' and '_Atomic', and that fixes this
bug for me.

Yuan, is that the right fix?  I've installed it on the emacs-29
branch.