Function impl

imperative/python/src/pyext17.h:168–175

        static constexpr int flags = METH_NOARGS;

        static PyObject* impl(PyObject* self, PyObject*) {
            auto* inst = reinterpret_cast<wrap_t*>(self)->inst();
            try {
                CVT_RET_PYOBJ((inst->*f)());
            }
            PYEXT17_TRANSLATE_EXC_RET(nullptr)
        }
    };

    template <auto f>
    struct meth<meth_type::varkw, f> {