bug#56256: closed (Emacs 28.1 gets stuck when typing some C++ code)

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Your message dated Sat, 2 Jul 2022 16:23:15 +0000
with message-id <YsBw830NyhxCXdle@ACM>
and subject line Re: bug#56256: Emacs 28.1 gets stuck when typing some C++ code
has caused the debbugs.gnu.org bug report #56256,
regarding Emacs 28.1 gets stuck when typing some C++ code
to be marked as done.

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56256: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=56256
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> --- Begin Message ---
>
>
>
> Subject: 
>
> Emacs 28.1 gets stuck when typing some C++ code
>
>
>
>
> Date: 
>
> Mon, 27 Jun 2022 18:22:15 +0800
>
>
>
>
> Emacs gets stuck when trying to type the '&' character at the end of the 
> buffer when there's the following code in C++ mode (this code is from 
> https://www.gingerbill.org/article/2015/08/19/defer-in-cpp/):
>
> ```
>
> template <typename F>
> struct privDefer {
>     F f;
>     privDefer(F f) : f(f) {}
>     ~privDefer() { f(); }
> };
>
> template <typename F>
> privDefer<F> defer_func(F f) {
>     return privDefer<F>(f);
> }
>
> #define DEFER_1(x, y) x##y
> #define DEFER_2(x, y) DEFER_1(x, y)
> #define DEFER_3(x)    DEFER_2(x, __COUNTER__)
> #define defer(code) auto DEFER_3(_defer_) = defer_func([
>
> ```
>
> Steps to reproduce:
>
> 1. create a C++ source file with this code and open it with Emacs, if 
> the file doesn't have a C++ source suffix, enable c++mode
>
> 2. type the '&' symbol at the last line after "defer_func(["
>
> 3. then Emacs gets stuck
>
> I can see this bug in Emacs 28.1 and git revision 
> 5b1bb1af030597aab7f7895b6e3da9b430f9438a. I've also tried ``emacs -Q`` 
> and ``emacs -Q -nw``, the bug still exists.
>
>
>
>
> --- End Message ---
> --- Begin Message ---
>
>
>
> Subject: 
>
> Re: bug#56256: Emacs 28.1 gets stuck when typing some C++ code
>
>
>
>
> Date: 
>
> Sat, 2 Jul 2022 16:23:15 +0000
>
>
>
>
> Hello, Iru.
>
> On Wed, Jun 29, 2022 at 11:03:47 +0800, Iru Cai wrote:
>
> > On 2022/6/29 00:28, Alan Mackenzie wrote:
> > > I think the following patch should fix it.  Could you try it out on your
> > > real C++ code, please, and tell us whether the bug is actually fixed.
> > > (If you want any help with applying the patch or byte compiling CC Mode
> > > afterwards, feel free to send me private email.):
>
> > Thanks, this fixes this bug, and I haven't found a issue when editing 
> > some of my C++ code.
>
> [ .... ]
>
> Thanks for the testing!
>
> I've committed the patch to the release branch of our git tree, and I'm
> closing the bug with this post.
>
> -- 
> Alan Mackenzie (Nuremberg, Germany).
>
>
> --- End Message ---