reveal (BlankSlate)

    # File lib/active_support/vendor/builder-2.1.2/blankslate.rb, line 38
        def reveal(name)
          bound_method = nil
          unbound_method = find_hidden_method(name)
          fail "Don't know how to reveal method '#{name}'" unless unbound_method
          define_method(name) do |*args|
            bound_method ||= unbound_method.bind(self)
            bound_method.call(*args)
          end
        end