bug#11307: 24.1.50; `testcover-start' fails for magit.el --text follow

[PJ Weisberg <pj@irregularexpressions.net>]

When running `testcover-start' on magit.el (Available at
https://github.com/magit/magit/downloads), an error occurs in
`edebug-slow-before'.  The line "(setcar edebug-offset-indices
edebug-after-index)" is executed when edebug-offset-indices is nil.

This is from he latest trunk build of Emacs.

-PJ

Gehm's Corollary to Clark's Law: Any technology distinguishable from
magic is insufficiently advanced.


In GNU Emacs 24.1.50.3 (x86_64-unknown-linux-gnu, X toolkit, Xaw scroll bars)
 of 2012-04-21 on pj-laptop
Windowing system distributor `The X.Org Foundation', version 11.0.11104000
Configured using:
 `configure 'prefix=/home/pj' '--with-x-toolkit=lucid''

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:
  diff-auto-refine-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-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
  line-number-mode: t
  transient-mark-mode: t

Recent input:
( r e q u i r e SPC ' t e s t c o v e r ) C-x C-e M-x
t e s t c o v <tab> s t <tab> <return> m a g i t .
e l <return> M-x r e p o <tab> r t SPC e m <tab> <
return>

Recent messages:
Edebug: magit-password
Edebug: magit-process-filter
Edebug: magit-run
Edebug: magit-run-git
Edebug: magit-run-git-with-input
Edebug: magit-run-git-async
Edebug: magit-run-async-with-input
Edebug: magit-display-process
list: Wrong type argument: consp, nil
Making completion list...

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml
mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev
gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util
mail-prsvr mail-utils help-mode help-fns edmacro kmacro ediff-merg
ediff-diff ediff-wind ediff-help ediff-util ediff-mult ediff-init ediff
ido iswitchb view diff-mode log-edit easy-mmode ring pcvs-util add-log
cl-specs cl vc-git testcover edebug easymenu time-date tooltip
ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd
fontset image regexp-opt fringe lisp-mode register page menu-bar
rfn-eshadow timer select scroll-bar 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 minibuffer loaddefs button faces
cus-face files text-properties overlay sha1 md5 base64 format env
code-pages mule custom widget hashtable-print-readable backquote
make-network-process dbusbind dynamic-setting system-font-setting
font-render-setting x-toolkit x multi-tty emacs)