Stefan Monnier <monnier@iro.umontreal.ca> schrieb am Do., 28. Sep. 2017 um
23:22 Uhr:

> >> >>> -  (or (char-after (point)) :json-eof))
> >> >> I wonder why it used :json-eof instead of using nil ?
> >> >> Any idea?
> >> > Not sure--it has been there since json.el was added to Emacs.
> >> Then why use 0 now instead of nil?
> > Because `following-char' returns 0 at EOB. "At the end of the buffer or
> > accessible region, return 0."
>
> But it also returns 0 in other cases.  E.g. if you had changed
>
>     (or (char-after (point)) :json-eof)
> to
>     (char-after)
>
> it would give you nil at EOB (instead of 0).
>
>
Agreed.
I'm wondering what the purpose of `following-char' is. Even in the rare
cases where you want to treat EOB and a following null character
identically it would be cleaner to write (or (char-after) 0).