Bug in Info-extract-menu-node-name

[Jesper Harder]

In GNU Emacs 21.3.50.141 (i686-pc-linux-gnu)
 of 2003-07-11 on defun.localdomain

I get this backtrace when I go to the "(elisp)List Motion" node and
activate the "Parsing Expressions" @xref:

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  string-match("[       \n]+" nil nil)
  (setq i (string-match "[      \n]+" target i))
  (while (setq i (string-match "[       \n]+" target i)) (setq target (concat 
... " " ...)) (setq i (+ i 1)))
  (let (target i (str ...) (case-fold-search t)) (while (setq i ...) (setq str 
...) (setq i ...)) (save-excursion (goto-char ...) (or ... ...) (goto-char ...) 
(setq target ...)) (while (setq i ...) (setq target ...) (setq i ...)) 
(Info-goto-node target))
  Info-follow-reference("Parsing\nExpressions")
  Info-try-follow-nearest-node()
  Info-follow-nearest-node()
  call-interactively(Info-follow-nearest-node)
  execute-extended-command(nil)
  call-interactively(execute-extended-command)