bug#40576: call-process-region does not accept nil as first argument

[Philipp Stephani <p.stephani2@gmail.com>]

Am So., 12. Apr. 2020 um 18:01 Uhr schrieb Philipp Stephani
<p.stephani2@gmail.com>:
>
> Am So., 12. Apr. 2020 um 17:44 Uhr schrieb Pietro Giorgianni
> <giorgian@gmail.com>:
> >
> > Hi,
> >
> > According to the documentation of call-process-region,
> >   If START is nil, that means to use the entire buffer contents; END is
> > ignored.
> >
> > But when I run:
> > (call-process-region nil nil "/bin/cat" t (current-buffer))
> > I get:
> > Debugger entered--Lisp error: (wrong-type-argument integer-or-marker-p nil)
> >   call-process-region(nil nil "/bin/cat" t #<buffer *scratch*>)
> >   eval((call-process-region nil nil "/bin/cat" t (current-buffer)) nil)
> >   elisp--eval-last-sexp(t)
> >   eval-last-sexp(t)
> >   eval-print-last-sexp(nil)
> >   funcall-interactively(eval-print-last-sexp nil)
> >   call-interactively(eval-print-last-sexp nil nil)
> >   command-execute(eval-print-last-sexp)
> >
> > If, instead, I run:
> > (call-process-region (point-min) (point-max) "/bin/cat" t (current-buffer))
> >
> > It works.
> >
> > Am I interpreting the documentation wrong?
>
> Nope, looks like a genuine bug (that happens only if DELETE is non-nil).

I've now fixed this on master (commit 42306747d8).