--- method_removed(name)  ruby 1.7 feature

    ᥽åɤ Module#remove_method [Module/remove_method] ˤ
    줿˥󥿥ץ꥿ƤӽФޤ
    name ˤϺ줿᥽å̾ Symbol Ϥޤ

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

          def foo
          end
          remove_method :foo
        end

        => method "foo" was removed

    ðۥ᥽åɤκФեåˤ
    Object#singleton_method_removed [Object/singleton_method_removed]
    Ȥޤ

