fails with another error

```
[translation:ERROR]  NoSuchAttrError: ("setting forbidden attribute 'name' on <ClassDef 'topaz.objects.objectobject.W_RootObject'>", <
[translation:ERROR]  v39 = getattr(w_cls_0, ('name'))
[translation:ERROR] In <FunctionGraph of (topaz.objspace:630)convert_type at 0x3fcbed0>:
[translation:ERROR] Happened at file topaz/objspace.py line 641
[translation:ERROR]
[translation:ERROR]                 src_cls = self.getclass(w_obj).name
[translation:ERROR]                 raise self.error(
[translation:ERROR] ==>                 self.w_TypeError, "can't convert %s into %s" % (src_cls, w_cls.name)

```