bug#64442: 29.0.92; treesit-beginning-of-defun fails in DEFUN functions in C

[Eli Zaretskii]

> From: Yuan Fu <casouri@gmail.com>
> Date: Sun, 13 Aug 2023 22:20:56 -0700
> Cc: 64442@debbugs.gnu.org
> 
> > I like this much better than what we have now, thanks.  But I have a
> > question: can we perhaps recognize the "function" of the body as such,
> > and then automatically move to the previous defun, which is the right
> > place?  The "defun" that is the body has no name, so maybe that could
> > be used as a sign?  
> 
> We can easily tell the body from the declaration, but we can’t easily tell 
> whether we should automatically move forward or backward. When point arrives 
> at the point between the declaration and the body, should it move to the 
> beginning of the next defun or the beginning of the declaration? This, plus 
> it’s not straightforward to know whether we are in between a body and a 
> declaration. I really don’t want to add even more cursed hacks into 
> c-ts-mode.el :-)

Too bad, but okay.

> > That would allow "C-x 4 a" to work inside a DEFUN,
> > something that still works less reliably with this patch: you must be
> > in the "first defun" to get it to find the name of the function.
> 
> C-x 4 a should’ve been fixed already. And it shouldn’t rely on this fix to 
> work. Do you have a recipe for when it doesn’t work?

Just try it with your patch.  If point is inside the body, the
function's name is not captured by "C-x 4 a".