py: Implement base class lookup, issubclass, isinstance.
diff --git a/unix/main.c b/unix/main.c
index caec900..15a4000 100644
--- a/unix/main.c
+++ b/unix/main.c
@@ -218,7 +218,7 @@
// test_obj = TestClass()
// test_obj.attr = 42
mp_obj_t test_class_type, test_class_instance;
- test_class_type = mp_obj_new_type(qstr_from_str_static("TestClass"), mp_obj_new_dict(0));
+ test_class_type = mp_obj_new_type(qstr_from_str_static("TestClass"), mp_const_empty_tuple, mp_obj_new_dict(0));
rt_store_name(qstr_from_str_static("test_obj"), test_class_instance = rt_call_function_0(test_class_type));
rt_store_attr(test_class_instance, qstr_from_str_static("attr"), mp_obj_new_int(42));