bug#20383: 25.0.50; c-mode: incorrect fontification of function arguments

bug#20383: 25.0.50; c-mode: incorrect fontification of function arguments

[Dima Kogan]

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Hi. This is very similar to

 http://debbugs.gnu.org/cgi/bugreport.cgi?bug=19669

but with different input.

I'm running an emacs built from 65ac8bc (master branch as of 2015/4/18)

Recipe:

1. emacs -nw -Q tst.c (open attached source)
2. C-n C-o //         (navigate to next line, start a new comment)

At this point, the buffer looks like the attached image. Note that at
step 2, the coloration of the 3rd and 5th arguments changed. This is
wrong. In normal use I see this popping up in response to various
inputs, not just starting a comment in some arbitrary place.

Thanks


[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: tst.c --]
[-- Type: text/x-csrc, Size: 825 bytes --]

// X xxx xxx x 2xx-xxxxx xxxx  xxx xxxx X xx, X xxx'x
void xxxx_xxxxxx_xxx_xxxxx( // xxxxx, xxxxxx
                            // xxxxxxx xxxxx xx xxxxx
                            struct xxxxx_x* x,

                            // xxxxxx
                            long xxxx_xxxx,

                            // xxxxxxxxx xxxx xxxxxx xx xxxxxxx
                            T    (*x )(const struct xxxxx_x* x),
                            void (*x) (      struct xxxxx_x* xxxxxx,
                                       const struct xxxxx_x* x),
                            T (*x_xxx_x) (      struct xxxxx_x* xxxxxx,
                                          const struct xxxxx_x* x),
                            void (*Xx)(      struct xxxxx_x* xxxxxx,
                                       const struct xxxxx_x* x))
{
}

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bug#20383: 25.0.50; c-mode: incorrect fontification of function arguments

[Lars Ingebrigtsen]

Dima Kogan <dima@secretsauce.net> writes:

> 1. emacs -nw -Q tst.c (open attached source)
> 2. C-n C-o //         (navigate to next line, start a new comment)
>
> At this point, the buffer looks like the attached image. Note that at
> step 2, the coloration of the 3rd and 5th arguments changed. This is
> wrong. In normal use I see this popping up in response to various
> inputs, not just starting a comment in some arbitrary place.

(This bug report unfortunately got no response at the time.)

I can confirm that this bug is still present in Emacs 28.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#20383: 25.0.50; c-mode: incorrect fontification of function arguments

[Lars Ingebrigtsen]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> I can confirm that this bug is still present in Emacs 28.

Uhm...  I think I did it wrong.  That is, I can see the described
behaviour after one "/", but after two slashes, the fontification is, as
far as I can tell, totally correct.

So I'm closing this bug report.  If there's more to be done here, please
respond to the debbugs address, and we'll reopen.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no