bug#7842: 23.2; call-process should be able to send stderr to buffer object

[Jameson Rollins]

Currently the call-process function lets one send stderr to a file by
providing a list as the BUFFER argument which includes the name of a
STDERR-FILE:

(call-process "ls" nil (list t "/path/to/stderr/file") nil "/does-not-exist")

It would be nice if one could instead send stderr directly to a distinct
buffer, i.e.:

(call-process "ls" nil (list t (get-buffer "*scratch*")) nil "/does-not-exist")

If I try that now I get:

Debugger entered--Lisp error: (wrong-type-argument stringp #<buffer *scratch*>)
  call-process("ls" nil (t #<buffer *scratch*>) nil "/does-not-exist")
  eval((call-process "ls" nil (list t (get-buffer "*scratch*")) nil 
"/does-not-exist"))
  eval-last-sexp-1(t)
  eval-last-sexp(t)
  eval-print-last-sexp()
  call-interactively(eval-print-last-sexp nil nil)

Thanks!

In GNU Emacs 23.2.1 (i486-pc-linux-gnu, GTK+ Version 2.20.1)
 of 2010-11-03 on potassium, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.10707000
configured using `configure  '--build' 'i486-linux-gnu' '--build' 
'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' 
'--libexecdir=/usr/lib' '--localstatedir=/var/lib' '--infodir=/usr/share/info' 
'--mandir=/usr/share/man' '--with-pop=yes' 
'--enable-locallisppath=/etc/emacs23:/etc/emacs:/usr/local/share/emacs/23.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.2/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/23.2/leim'
 '--with-x=yes' '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars' 
'build_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -g -O2' 'LDFLAGS=-g' 'CPPFLAGS=''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Emacs-Lisp

Minor modes in effect:
  iswitchb-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<tab> <tab> C-g M-x w r i <tab> t o <tab> <tab> M-b 
C-g M-x i n s <tab> <tab> C-g C-x C-s M-f <right> M-d 
g e t - b u f f e r M-b M-b ( M-f M-f SPC m e s s a 
g e s SPC ) <left> <left> <left> <left> <left> <right> 
<right> <right> <right> M-b C-x b m e s s C-g " * M 
<right> <right> <left> <backspace> M-f * " <right> 
<backspace> <down> <up> C-x C-s <down> <up> M-b M-b 
M-b <left> <left> <left> l i s t SPC M-b <left> <backspace> 
C-x C-s M-f <right> <right> <right> M-d M-d C-d C-x 
C-s M-f <right> <right> C-d C-x C-s <down> <down> <up> 
<up> <up> <down> <down> <up> M-b <left> <left> M-d 
C-d C-d n i l C-x C-s C-x b <return> M-< C-u C-SPC 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> M-x e m <tab> a <tab> b u <tab> <tab> M-b C-k 
f i <tab> <tab> <backspace> <backspace> M-b C-k r e 
<tab> p <tab> o r <tab> M-b <C-tab> C-e <tab> e m <tab> 
<return>

Recent messages:
Saving file /home/jrollins/src/notmuch/git/emacs/notmuch-query.el...
Wrote /home/jrollins/src/notmuch/git/emacs/notmuch-query.el
Saving file /home/jrollins/src/notmuch/git/emacs/notmuch-query.el...
Wrote /home/jrollins/src/notmuch/git/emacs/notmuch-query.el
Saving file /home/jrollins/src/notmuch/git/emacs/notmuch-query.el...
Wrote /home/jrollins/src/notmuch/git/emacs/notmuch-query.el
Saving file /home/jrollins/src/notmuch/git/emacs/notmuch-query.el...
Wrote /home/jrollins/src/notmuch/git/emacs/notmuch-query.el
Mark set
Making completion list... [5 times]

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org-install emacs-goodies-el emacs-goodies-custom emacs-goodies-loaddefs
easy-mmode dpkg-dev-el dpkg-dev-el-loaddefs develock advice help-fns
advice-preload bbdb-autoloads preview-latex tex-site auto-loads tooltip
ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd font-setting
tool-bar dnd fontset image fringe lisp-mode register page menu-bar
rfn-eshadow timer select scroll-bar mldrag mouse jit-lock font-lock
syntax facemenu font-core frame cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese hebrew greek
romanian slovak czech european ethiopic indian cyrillic chinese
case-table epa-hook jka-cmpr-hook help simple abbrev loaddefs button
minibuffer faces cus-face files text-properties overlay md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote make-network-process dbusbind system-font-setting
font-render-setting gtk x-toolkit x multi-tty emacs)