Fix assertion failures in super_attr

micropython: ../../py/objtype.c:1100: super_attr: Assertion `MP_OBJ_IS_TYPE(self->type, &mp_type_type)' failed.

e.g., when making calls like
    super(1, 1).x

1 files changed, 3 insertions, 0 deletions

diff --git a/py/objtype.c b/py/objtype.c
index 3fa25eb77..5b70e8e48 100644
--- a/py/objtype.c
+++ b/py/objtype.c
@@ -1085,6 +1085,9 @@ STATIC mp_obj_t super_make_new(const mp_obj_type_t *type_in, size_t n_args, size
     // 0 arguments are turned into 2 in the compiler
     // 1 argument is not yet implemented
     mp_arg_check_num(n_args, n_kw, 2, 2, false);
+    if(!MP_OBJ_IS_TYPE(args[0], &mp_type_type)) {
+        mp_raise_TypeError("first argument to super() must be type");
+    }
     mp_obj_super_t *o = m_new_obj(mp_obj_super_t);
     *o = (mp_obj_super_t){{type_in}, args[0], args[1]};
     return MP_OBJ_FROM_PTR(o);