Subject: 23.1; -batch -f butterfly doesn't work
From: [email-masked]
To: [email-masked]
Date: Mon, 05 Oct 2009 22:24:57 -0700 (PDT)

It would be nice if this did something more meaningful:

$ emacs -Q -batch -f butterfly
Do you really want to unleash the powers of the butterfly? (yes or no) yes
Wrong type argument: wholenump, -1