gistfile1.txt

ruby-1.9.2-head :001 > module M1
ruby-1.9.2-head :002?>   def self.m1
ruby-1.9.2-head :003?>     "self.m1 in M1"
ruby-1.9.2-head :004?>     end
ruby-1.9.2-head :005?>   end
 => nil 
ruby-1.9.2-head :006 > module M2
ruby-1.9.2-head :007?>   include M1
ruby-1.9.2-head :008?>   def self.m2
ruby-1.9.2-head :009?>     m1
ruby-1.9.2-head :010?>     end
ruby-1.9.2-head :011?>   end