bug#22884: 25.0.92; C/l mode editing takes waaaayy too long

[Eli Zaretskii]

> Date: Thu, 3 Mar 2016 19:23:30 +0000
> From: Alan Mackenzie <acm@muc.de>
> Cc: 22884@debbugs.gnu.org
> 
> OK.  Could you give me a clue as to what they mean, please?  For
> example, in
> 
>     INLINE EMACS_INT
>     (XLI) (Lisp_Object o)
>     {
>       return lisp_h_XLI (o);
>     }
> 
> , what does "(XLI)" do?

It's an age-old method of calling a function without risking it being
shadowed by a macro, AFAIK.

> It can't be an expansion of the CPP macro "XLI", surely, lacking, as
> it does, an argument.

Exactly.  And that's why it ensures a function will be called instead
of the macro.