haskell mode, start interpreter ineffective

[Larry Evans]

In haskell mode, there's a Haskell menu on the menu bar.
After selecting the Haskell menu, there's an entry:

  Start interpreter C-c C-b

However, selecting that entry doesn't change anything
AFAICT.  What is that supposed to do?

At the bottom of my ~/.emacs file, there's:

  (add-hook 'haskell-mode-hook 'turn-on-haskell-doc-mode)
  (add-hook 'haskell-mode-hook 'turn-on-haskell-indent)

My uname shows:

  evansl@evansl-desktop:~$ uname -a
  Linux evansl-desktop 2.6.32-24-generic #41-Ubuntu SMP Thu Aug 19
01:38:40 UTC 2010 x86_64 GNU/Linux


My eamcs --version shows:

  evansl@evansl-desktop:~$ emacs --version
  GNU Emacs 23.1.1
  Copyright (C) 2009 Free Software Foundation, Inc.

TIA.

-Larry