empty strings in the command history

Dear Bug Team! Please try the following expression: (defvar hoge-history nil) (completing-read "Hoge: " '(("a") ("b")) nil nil nil 'hoge-history) Then you will be asked, just type enter here, hoge-history is set to (""). I'm afraid this is a known issue, but it often obstructive to track down the command history. In GNU Emacs, empty strings are securely removed from HISTORY. ================================================================ System Info to help track down your bug: --------------------------------------- uname -a: Linux aquair 2.4.18-pre9 #1 Wed Feb 13 15:12:54 JST 2002 i686 unknown ./configure '--with-mule' '--with-site-lisp' XEmacs 21.4.6 "Common Lisp" configured for `i686-pc-linux'. Compilation / Installation: Source code location: /opt/tmp/xemacs-21.4.6 Installation prefix: /usr/local Operating system description file: `s/linux.h' Machine description file: `m/intel386.h' Compiler: gcc -g -O3 -Wall -Wno-switch -Winline -Wmissing-prototypes -Wsign-compare -Wshadow Relocating allocator for buffers: no GNU version of malloc: yes - Using Doug Lea's new malloc from the GNU C Library. Linking with `-z nocombreloc'. - Consider configuring with --pdump. Window System: Compiling in support for the X window system: - X Windows headers location: /usr/X11/include - X Windows libraries location: /usr/X11/lib - Handling WM_COMMAND properly. Using Lucid menubars. Using Lucid scrollbars. TTY: Compiling in support for ncurses. Compiling in support for GPM (General Purpose Mouse). Images: Compiling in support for GIF images (builtin). Compiling in support for XPM images. Compiling in support for PNG images. Compiling in support for JPEG images. Compiling in support for TIFF images. Compiling in support for X-Face message headers. Sound: Compiling in support for sound (native). Compiling in support for NAS (network audio system). Databases: Compiling in support for Berkeley database. Compiling in support for GNU DBM. Compiling in support for LDAP. Internationalization: Compiling in support for Mule (multi-lingual Emacs). Compiling in support for XIM (X11R5+ I18N input method). - Using raw Xlib to provide XIM support. Mail: Compiling in support for "dot-locking" mail spool file locking method. Other Features: Inhibiting IPv6 canonicalization at startup. Compiling in support for dynamic shared object modules. Load-Path Lisp Shadows: ---------------------- (/usr/local/lib/xemacs/site-lisp/ps-print /usr/local/lib/xemacs/site-lisp/ps-print/ps-print /usr/local/lib/xemacs/site-lisp/ps-mule /usr/local/lib/xemacs/site-lisp/ps-print/ps-mule /usr/local/lib/xemacs/site-lisp/ps-bdf /usr/local/lib/xemacs/site-lisp/ps-print/ps-bdf /usr/local/lib/xemacs/site-lisp/camldebug /usr/local/lib/xemacs/site-lisp/tuareg/camldebug /usr/local/lib/xemacs/site-lisp/xbm-thumb /usr/local/lib/xemacs/site-packages/lisp/lsdb/xbm-thumb /usr/local/lib/xemacs/site-lisp/starttls /usr/local/lib/xemacs/site-lisp/deal /usr/local/lib/xemacs/mule-packages/lisp/chise/deal /usr/local/lib/xemacs/mule-packages/lisp/flim/sha1-el /usr/local/lib/xemacs/site-lisp/starttls /usr/local/lib/xemacs/mule-packages/lisp/flim/starttls /usr/local/lib/xemacs/site-packages/lisp/t-gnus/hex-util /usr/local/lib/xemacs/mule-packages/lisp/flim/hex-util /usr/local/lib/xemacs/site-lisp/starttls /usr/local/lib/xemacs/site-lisp/bbdb-wl /usr/local/lib/xemacs/mule-packages/lisp/wl/bbdb-wl /usr/local/lib/xemacs/mule-packages/lisp/skk/queue-m /usr/local/lib/xemacs/xemacs-packages/lisp/elib/queue-m /usr/local/lib/xemacs/site-lisp/starttls /usr/local/lib/xemacs/xemacs-packages/lisp/mail-lib/starttls /usr/local/lib/xemacs/mule-packages/lisp/flim/smtpmail /usr/local/lib/xemacs/xemacs-packages/lisp/mail-lib/smtpmail /usr/local/lib/xemacs/site-packages/lisp/t-gnus/rfc2104 /usr/local/lib/xemacs/xemacs-packages/lisp/mail-lib/rfc2104 /usr/local/lib/xemacs/site-packages/lisp/t-gnus/pop3 /usr/local/lib/xemacs/xemacs-packages/lisp/mail-lib/pop3 /usr/local/lib/xemacs/site-packages/lisp/t-gnus/mailheader /usr/local/lib/xemacs/xemacs-packages/lisp/mail-lib/mailheader /usr/local/lib/xemacs/site-lisp/rd-mode /usr/local/lib/xemacs/xemacs-packages/lisp/ruby/rd-mode /usr/local/lib/xemacs/xemacs-packages/lisp/prog-modes/inf-ruby /usr/local/lib/xemacs/xemacs-packages/lisp/ruby/inf-ruby /usr/local/lib/xemacs/xemacs-packages/lisp/prog-modes/ruby-mode /usr/local/lib/xemacs/xemacs-packages/lisp/ruby/ruby-mode /usr/local/lib/xemacs/xemacs-packages/lisp/mail-lib/base64 /usr/local/lib/xemacs/xemacs-packages/lisp/w3/base64 /usr/local/lib/xemacs/site-lisp/xml /usr/local/lib/xemacs/xemacs-packages/lisp/w3/xml /usr/local/lib/xemacs/mule-packages/lisp/flim/md5 /usr/local/lib/xemacs/xemacs-packages/lisp/w3/md5 /usr/local/lib/xemacs/site-packages/lisp/apel/timezone /usr/local/lib/xemacs/xemacs-packages/lisp/xemacs-base/timezone /usr/local/lib/xemacs/site-packages/lisp/apel/alist /usr/local/lib/xemacs-21.4.6/lisp/alist /usr/local/lib/xemacs/xemacs-packages/lisp/w3/font /usr/local/lib/xemacs-21.4.6/lisp/font) Installed XEmacs Packages: ------------------------- ((xslt-process:version 1.06 :type regular) (xemacs-devel :version 1.43 :type single-file) (xemacs-base :version 1.61 :type regular) (viper :version 1.33 :type regular) (view-process :version 1.11 :type regular) (vc-cc :version 1.18 :type regular) (vc :version 1.3 :type regular) (tramp :version 1.04 :type regular) (time :version 1.11 :type regular) (textools :version 1.12 :type regular) (text-modes :version 1.4 :type single-file) (texinfo :version 1.2 :type regular) (speedbar :version 1.23 :type regular) (sounds-wav :version 1.1 :type regular) (sounds-au :version 1.1 :type regular) (sh-script :version 1.14 :type regular) (semantic :version 1.12 :type regular) (scheme :version 1.11 :type regular) (ruby :version 0.02 :type single-file) (rmail :version 1.13 :type regular) (reftex :version 1.25 :type regular) (psgml :version 1.27 :type regular) (prog-modes :version 1 .53 :type single-file) (pcomplete :version 1.01 :type regular) (pcl-cvs :version 1.6 :type regular) (os-utils :version 1.26 :type single-file) (net-utils :version 1.24 :type single-file) (misc-games :version 1.15 :type single-file) (mh-e :version 1.14 :type regular) (mailcrypt :version 2.11 :type regular) (mail-lib :version 1.44 :type regular) (jde :version 1.34 :type regular) (ispell :version 1.24 :type regular) (ilisp :version 1.2 :type regular) (igrep :version 1.08 :type regular) (hm--html-menus :version 1.18 :type regular) (gnats :version 1.14 :type regular) (games :version 1.13 :type regular) (fsf-compat :version 1.11 :type single-file) (frame-icon :version 1.09 :type regular) (forms :version 1.14 :type regular) (footnote :version 1.14 :type regular) (eudc :version 1.36 :type regular) (eterm :version 1.13 :type regular) (eshell :version 1.03 :type regular) (emerge :version 1.09 :type regular) (elib :version 1.1 :type single-file) (eieio :version 1.02 :type regular) (efs :version 1.28 :type regular) (edit-utils :version 1.82 :type single-file) (ediff :version 1.39 :type regular) (edebug :version 1.14 :type regular) (dired :version 1.11 :type regular) (debug :version 1.14 :type regular) (cookie :version 1.14 :type regular) (cc-mode :version 1.27 :type regular) (calendar :version 1.18 :type regular) (calc :version 1.19 :type regular) (c-support :version 1.16 :type single-file) (bbdb :version 1.2 :type regular) (auctex :version 1.3 :type regular) (mule-ucs :version 1.04 :type regular) (mule-base :version 1.39 :type regular) (migemo :version 0.01 :type single-file) (lookup :version 1.1 :type regular) (locale :version 1.18 :type regular) (leim :version 1.17 :type regular) (edict :version 1.13 :type regular) (big5conv :version 0.01 :type single-file)) Features: -------- (efs-cu gnus-util netrc time-date parse-time cookie1 footnote message messagexmas mime-edit eword-encode pgg-parse pccl pccl-20 pgg-def signature mime-image mime-view mime-conf calist mail-abbrevs nnheader nnheaderxm mmgnus mmbuffer mmgeneric luna mime eword-decode mel path-util mime-def mcharset mcs-20 mcs-xm mcs-xmu pcustom std11 poem poem-xm pces pces-xfc pces-20 broken pces-xm byte-optimize bytecomp byte-compile poe-xemacs timer overlay poe mail-utils mailheader canlock xemacsbug shadow sendmail rfc822 font-lock icomplete nnir-theme semi-theme mu-cite-theme aspell-theme iiimcf-sc cus-face iiimcf iiimp un-define mule-uni allout outline habbrev ring completer jka-compr mime-w3m font disp-table mime-setup mail-mime-setup alist pym static apel-ver product semi-setup semi-def advice advice-preload uniquify edmacro iswitchb recent-files savehist deal avoid xslt-process-autoloads xemacs-devel-autoloads xemacs-base-autoloads w3-autoloads viper-autoloads view-process-autoloads vc-cc-autoloads vc-autoloads tramp-autoloads time-autoloads textools-autoloads text-modes-autoloads texinfo-autoloads speedbar-autoloads sounds-wav-autoloads sounds-au-autoloads sh-script-autoloads semantic-autoloads scheme-autoloads ruby-autoloads rmail-autoloads reftex-autoloads psgml-autoloads prog-modes-autoloads pcomplete-autoloads pcl-cvs-autoloads os-utils-autoloads net-utils-autoloads misc-games-autoloads mh-e-autoloads mailcrypt-autoloads mail-lib-autoloads jde-autoloads ispell-autoloads ilisp-autoloads igrep-autoloads hm--html-menus-autoloads gnats-autoloads games-autoloads fsf-compat-autoloads frame-icon-autoloads forms-autoloads footnote-autoloads eudc-autoloads eterm-autoloads eshell-autoloads emerge-autoloads elib-autoloads eieio-autoloads efs-autoloads edit-utils-autoloads ediff-autoloads edebug-autoloads dired-autoloads debug-autoloads cookie-autoloads cc-mode-autoloads calendar-autoloads calc-autoloads c-support-autoloads bbdb-autoloads auctex-autoloads wl-autoloads skk-autoloads skk-setup semi-autoloads mule-ucs-autoloads mule-base-autoloads mu-autoloads migemo-autoloads lookup-autoloads locale-autoloads liece-autoloads leim-autoloads flim-autoloads edict-autoloads chise-autoloads big5conv-autoloads gnus-autoloads lsdb-autoloads apel-autoloads lisp-autoloads loadhist auto-show fontl-hooks x-iso8859-1 slovenian czech romanian ccl mule-help code-cmds gutter-items menubar-items x-menubar mode-motion mouse itimer auto-save lisp-mode easymenu iso8859-1 page buff-menu lib-complete cus-file derived frame text-props obsolete cus-start custom widget cl-extra mini-cl cl cl-19 packages backquote very-early-lisp file-coding mule lucid-scrollbars cut-buffer lucid-menubars x c-balloon-help tty-frames tty toolbar nas-sound native-sound scrollbar unix-processes multicast network-streams subprocesses modules menu-accelerator-support menubar berkeley-db dbm md5 xemacs xim gutter tiff png gif jpeg xface xpm xbm lisp-float-type linux devices window-system base64) Recent keystrokes: ----------------- ESC x r e p o r t TAB e m TAB RET Recent messages (most recent first): ----------------------------------- Loading efs-cu...done Fontifying *mail to xemacs-beta＠xemacs.org*... Loading efs-cu... Loading gnus-util...done Loading gnus-util... Loading message...done Loading eword-encode...done Loading eword-encode... Loading byte-optimize...done Loading byte-optimize... Loading bytecomp...done Loading bytecomp... Loading message... Loading xemacsbug...done Loading xemacsbug... Fontifying *scratch*... done. Loading font-lock...done Fontifying *scratch*... (syntactically). Fontifying *scratch*... Loading font-lock... -- Daiki Ueno