From: "Peña, Botp" <botp@...>
Date: 2007-07-25T17:54:07+09:00
Subject: Re: Help: Get list of modules which are included in the class

From: Robert Dober [mailto:robert.dober@gmail.com] 
# p C2.ancestors - (Class.new.ancestors + [C2])

yap, your scheme is more straightforward

(C.ancestors-[Kernel]).select{|x| x.class == Module}