--- method_undefined(name)  ruby 1.7 feature

    ᥽åɤ Module#undef_method [Module/undef_method] ޤ
    undefˤ̤ˤ줿˥󥿥ץ꥿
    ƤӽФޤ
    name ˤ̤ˤ줿᥽å̾ Symbol Ϥޤ

        class Foo
          def Foo.method_undefined(name)
            puts "method \"#{name}\" was undefined"
          end

          def foo
          end
          def bar
          end
          undef_method :foo
          undef bar
        end

        => method "foo" was undefined
           method "bar" was undefined

    ðۥ᥽åɤ̤Фեåˤ
    Object#singleton_method_undefined [Object/singleton_method_undefined]
    Ȥޤ

