SCM_ASSERT_TYPE (po, outputter, SCM_ARG1, __FUNCTION__, "Paper_outputter");
SCM_ASSERT_TYPE (st, stencil, SCM_ARG1, __FUNCTION__, "Paper_outputter");
SCM_ASSERT_TYPE (po, outputter, SCM_ARG1, __FUNCTION__, "Paper_outputter");
SCM_ASSERT_TYPE (st, stencil, SCM_ARG1, __FUNCTION__, "Paper_outputter");