bug#55885: 29.0.50; missed error message

["Andreas Röhler" <andreas.roehler@easy-emacs.de>]

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The code below evaluates to nil, but should send an error:

(defvar foo-bar-baz
   (cond
       (t ()
       (when foo-bar-baz nil))))

Emacs 28.1 tells as expected:

Debugger entered--Lisp error: (void-variable foo-bar-baz)
   (if foo-bar-baz (progn nil))
   (cond (t nil (if foo-bar-baz (progn nil))))
   (defvar foo-bar-baz (cond (t nil (if foo-bar-baz (progn nil)))))
   eval((defvar foo-bar-baz (cond (t nil (if foo-bar-baz (progn nil))))) 
nil)
   elisp--eval-last-sexp(nil)
   eval-last-sexp(nil)
   funcall-interactively(eval-last-sexp nil)
   call-interactively(eval-last-sexp nil nil)
   command-execute(eval-last-sexp)


------

In GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 
2.24.32, cairo version 1.16.0)
  of 2022-06-04
Repository revision: fe6f1dfeb4ad4aaf517d1ac34435f3750f7f4569
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12013000
System Description: Ubuntu 20.04.4 LTS

Configured using:
  'configure --with-modules -with-mailutils'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LIBOTF LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG
SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM
XINPUT2 XPM GTK2 ZLIB

Important settings:
   value of $LANG: de_DE.UTF-8
   locale-coding-system: utf-8-unix

Major mode: ELisp/d

Minor modes in effect:
   tooltip-mode: t
   global-eldoc-mode: t
   eldoc-mode: t
   show-paren-mode: t
   electric-indent-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
   line-number-mode: t
   indent-tabs-mode: t
   transient-mark-mode: t
   auto-composition-mode: t
   auto-encryption-mode: t
   auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message mailcap yank-media rmc puny
dired dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg
rfc6068 epg-config gnus-util text-property-search time-date 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-fns radix-tree cl-print debug backtrace help-mode find-func
cl-loaddefs cl-lib seq gv subr-x byte-opt bytecomp byte-compile cconv
iso-transl tooltip eldoc paren electric uniquify ediff-hook vc-hooks
lisp-float-type elisp-mode mwheel term/x-win x-win term/common-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list replace
newcomment text-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock
font-lock syntax font-core term/tty-colors frame minibuffer nadvice
simple cl-generic indonesian philippine 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 composite emoji-zwj charscript charprop case-table
epa-hook jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button
loaddefs faces cus-face macroexp files window text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget keymap
hashtable-print-readable backquote threads dbusbind inotify
dynamic-setting system-font-setting font-render-setting cairo
move-toolbar gtk x-toolkit xinput2 x multi-tty make-network-process
emacs)

Memory information:
((conses 16 141917 6454)
  (symbols 48 29644 0)
  (strings 32 64292 1986)
  (string-bytes 1 1009077)
  (vectors 16 12076)
  (vector-slots 8 173860 12616)
  (floats 8 23 35)
  (intervals 56 253 5)
  (buffers 992 13))

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