class RSpec::Mocks::MethodDouble

def restore_original_method
  if @stashed
    method_name = @method_name
    stashed_method_name = self.stashed_method_name
    object_singleton_class.instance_eval do
      remove_method method_name
      if method_defined?(stashed_method_name) || private_method_defined?(stashed_method_name)
        alias_method method_name, stashed_method_name
        remove_method stashed_method_name
      end
    end
    @stashed = false
  end
end