bug#30668: 27.0.50; Error in `completing-read'

[p . stephani2]

emacs -Q --eval='(completing-read "p: " nil)'

Hit <left> <SPC>.  An error will be signaled:

completion--some: Args out of range: "", 0, -1

Backtrace is

Debugger entered--Lisp error: (args-out-of-range "" 0 -1)
  completion-basic-try-completion("" nil nil -1)
  #f(compiled-function (style) #<bytecode 0x3aabd9>)(basic)
  completion--some(#f(compiled-function (style) #<bytecode 0x3aabd9>)  
(basic partial-completion emacs22))
  completion--nth-completion(1 "" nil nil -1 (metadata))
  completion-try-completion("" nil nil -1 (metadata))
  completion--try-word-completion("" nil nil -1 (metadata))
  completion--do-completion(4 4 completion--try-word-completion)
  completion-in-region--single-word(4 4 nil nil)
  minibuffer-complete-word()
  funcall-interactively(minibuffer-complete-word)
  call-interactively(minibuffer-complete-word nil nil)
  command-execute(minibuffer-complete-word)
  read-from-minibuffer("p: " nil (keymap (menu-bar keymap  
(minibuf "Minibuf" keymap (tab menu-item "Complete"  
minibuffer-complete :help "Complete as far as possible") (space  
menu-item "Complete Word" minibuffer-complete-word :help "Complete at most  
one word") (63 menu-item "List Completions"  
minibuffer-completion-help :help "Display all possible  
completions") "Minibuf")) (27 keymap (118 . switch-to-completions))  
(prior . switch-to-completions) (63 . minibuffer-completion-help) (32 .  
minibuffer-complete-word) (9 . minibuffer-complete) keymap (menu-bar keymap  
(minibuf "Minibuf" keymap (previous menu-item "Previous History Item"  
previous-history-element :help "Put previous minibuffer history element in  
the minibuffer") (next menu-item "Next History Item"  
next-history-element :help "Put next minibuffer history element in the  
minibuffer") (isearch-backward menu-item "Isearch History Backward"  
isearch-backward :help "Incrementally search minibuffer history backward")  
(isearch-forward menu-item "Isearch History Forward"  
isearch-forward :help "Incrementally search minibuffer history forward")  
(return menu-item "Enter"  
exit-minibuffer :key-sequence "\015" :help "Terminate input and exit  
minibuffer") (quit menu-item "Quit" abort-recursive-edit :help "Abort input  
and exit minibuffer") "Minibuf")) (10 . exit-minibuffer) (13 .  
exit-minibuffer) (7 . abort-recursive-edit) (C-tab .  
file-cache-minibuffer-complete) (9 . self-insert-command) (XF86Back .  
previous-history-element) (up . previous-line-or-history-element) (prior .  
previous-history-element) (XF86Forward . next-history-element) (down .  
next-line-or-history-element) (next . next-history-element) (27 keymap  
(114 . previous-matching-history-element) (115 .  
next-matching-history-element) (112 . previous-history-element) (110 .  
next-history-element))) nil nil nil nil)
  completing-read-default("p: " nil nil nil nil nil nil nil)
  completing-read("p: " nil)
  eval((completing-read "p: " nil))
  command-line-1(("-f" "toggle-debug-on-error" "--eval=(completing-read  
\"p: \" nil)"))
  command-line()
  normal-top-level()



In GNU Emacs 27.0.50 (build 22, x86_64-pc-linux-gnu, GTK+ Version 3.22.24)
 of 2018-03-01 built on localhost
Repository revision: 8643de540efcd993381e672808e4cb785ed7dcc2
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Debian GNU/Linux buster/sid

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
 'configure --without-threads --enable-gcc-warnings=warn-only
 --enable-gtk-deprecation-warnings --without-pop --with-mailutils
 --enable-checking --enable-check-lisp-object-type --with-modules
 'CFLAGS=-O0 -ggdb3''

Configured features:
XPM JPEG TIFF GIF PNG SOUND DBUS GSETTINGS NOTIFY GNUTLS FREETYPE XFT
ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 MODULES JSON

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

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-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
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny seq byte-opt gv
bytecomp byte-compile cconv cl-loaddefs cl-lib dired dired-loaddefs
format-spec rfc822 mml easymenu mml-sec password-cache epa derived epg
epg-config gnus-util rmail rmail-loaddefs mm-decode mm-bodies mm-encode
mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils elec-pair time-date
mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type 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 elisp-mode lisp-mode prog-mode register page menu-bar
rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core term/tty-colors 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 composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray 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 95079 7812)
 (symbols 48 20164 1)
 (miscs 40 40 121)
 (strings 32 28280 2193)
 (string-bytes 1 757641)
 (vectors 16 14175)
 (vector-slots 8 499100 13680)
 (floats 8 50 67)
 (intervals 56 223 0)
 (buffers 992 12))

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