From: "trans. (T. Onoma)" Date: 2004-11-01T04:50:50+09:00 Subject: undef_method cutting off subclass's method lookup? class Numeric def succ self + 1 end end class Integer undef_method( :succ ) end 2.class #=> Fixnum 2.succ NoMethodError: undefined method `succ' for 1:Fixnum from (irb):10 Shouldn't it be able to find #succ in the ancestor? T.