bug#22982: 25.0.92; Forms Mode seems to fail to open data file

[N. Jackson]

I get the error "Wrong-type-argument: stringp, nil" when I try to start
Forms Mode with

    M-x forms-find-file RET ~/Documents/test-forms.el RET

The backtrace is:

    Debugger entered--Lisp error: (wrong-type-argument stringp nil)
      expand-file-name(nil)
      find-file-noselect(nil)
      forms-mode(t)
      forms-find-file("~/Documents/test-forms.el")
      funcall-interactively(forms-find-file "~/Documents/test-forms.el")
      call-interactively(forms-find-file record nil)
      command-execute(forms-find-file record)
      execute-extended-command(nil "forms-find-file" nil)
      funcall-interactively(execute-extended-command nil "forms-find-file" nil)
      call-interactively(execute-extended-command nil nil)
      command-execute(execute-extended-command)

My forms control file (~/Documents/test-forms.el) is as follows:

    ;; This demo visits ‘/etc/passwd’.

    (setq forms-file "/etc/passwd")
    (setq forms-number-of-fields 7)
    (setq forms-read-only t)                 ; to make sure
    (setq forms-field-sep ":")
    ;; Don’t allow multi-line fields.
    (setq forms-multi-line nil)

    (setq forms-format-list
          (list
           "====== /etc/passwd ======\n\n"
           "User : "    1
           "   Uid: "   3
           "   Gid: "   4
           "\n\n"
           "Name : "    5
           "\n\n"
           "Home : "    6
           "\n\n"
           "Shell: "    7
           "\n"))

which is copied directly from the example in the Forms manual
(info "(forms) Format Description"). And /etc/passwd exists and is
accessible from Emacs.

I get exactly the same error with all forms control files I've tried,
even something as seemingly simple as:

    (setq forms-file "~/test-forms.dat")
    (setq forms-number-of-fields 2)
    (setq forms-format-list
          (list
           "Field1 : "    1
           "Field2 : "    2
           "\n"))

with a not yet existent data file.

Note: I checked Emacs 24.5 and I found I get the same error there.


In GNU Emacs 25.0.92.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.18.7)
 of 2016-03-03 built on moondust
Windowing system distributor 'Fedora Project', version 11.0.11800000
System Description:     Fedora release 23 (Twenty Three)

Configured using:
 'configure --prefix=/home/nlj/local/ --enable-checking=yes,glyphs
 'CFLAGS=-O0 -g3 -ggdb''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GCONF GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LC_MONETARY: en_DK.utf8
  value of $LC_NUMERIC: en_DK.utf8
  value of $LC_TIME: en_DK.utf8
  value of $LANG: en_CA.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: IBuffer

Minor modes in effect:
  recentf-mode: t
  display-battery-mode: t
  display-time-mode: t
  delete-selection-mode: t
  savehist-mode: t
  save-place-mode: t
  electric-pair-mode: t
  desktop-save-mode: t
  cua-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t

Recent messages:
Indenting region...done
Saving file /home/nlj/Documents/test-forms.el...
Wrote /home/nlj/Documents/test-forms.el
Entering debugger...
Making completion list...
mwheel-scroll: End of buffer
<mouse-6> is undefined
mwheel-scroll: Beginning of buffer [2 times]
Updating buffer list...done
Commands: m, u, t, RET, g, k, S, D, Q; q to quit; h for help
Quit

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ob-ref ob-lob ob-table ob-exp org-src ob-keys ob-comint comint
ansi-color ring ob-core ob-eval org-compat org-macs org-loaddefs
format-spec find-func bbdb-anniv diary-lib diary-loaddefs cal-menu
calendar cal-loaddefs bbdb-com crm mailabbrev bbdb bbdb-site timezone
bbdb-loaddefs finder-inf tex-site info package epg-config edmacro kmacro
recentf tree-widget wid-edit easymenu battery time wheatgrass-theme
delsel paren savehist saveplace elec-pair desktop frameset cl-loaddefs
pcase cl-lib cua-base cus-start cus-load time-date mule-util tooltip
eldoc electric uniquify ediff-hook vc-hooks lisp-float-type mwheel x-win
term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list newcomment elisp-mode lisp-mode prog-mode register page
menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core frame cl-generic cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese charscript case-table epa-hook jka-cmpr-hook help
simple abbrev minibuffer cl-preloaded nadvice loaddefs button faces
cus-face macroexp files text-properties overlay sha1 md5 base64 format
env code-pages mule custom widget hashtable-print-readable backquote
dbusbind inotify dynamic-setting system-font-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 459913 44311)
 (symbols 48 95644 0)
 (miscs 40 2254 9183)
 (strings 32 133733 24491)
 (string-bytes 1 4436986)
 (vectors 16 45313)
 (vector-slots 8 1283599 104576)
 (floats 8 552 827)
 (intervals 56 3228 182)
 (buffers 976 40)
 (heap 1024 116259 3182))