bug#1082: 23.0.60; read-char unexpectedly halts execution of script

[Markus Triska]

Let filter.el consist of the forms:

   (defun bc-filter (proc string)
     (message "%s" string))

   (message "starting")
   (setq bc (start-process "bc" nil "/usr/bin/bc"))
   (set-process-filter bc 'bc-filter)

   (while t
     (let ((char (read-char nil nil 0.1)))
       (message "char: %s" char)))

Where "/usr/bin/bc" is the GNU arbitrary precision calculator. Now:

   mt-computer:~ mt$ emacs --script filter.el
   starting
   mt-computer:~ mt$

I expect non-termination in this case, as in eval-buffer on filter.el.

In GNU Emacs 23.0.60.1 (i386-apple-darwin8.11.1, GTK+ Version 2.12.9)
 of 2008-09-24 on mt-computer.local
Windowing system distributor `The XFree86 Project, Inc', version 11.0.40400000
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_GB.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t