SF bug #699934: Obscure error message
Clarify error message for mro conflicts.
diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index a067cd5..b029777 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -1076,7 +1076,10 @@
}
n = PyDict_Size(set);
- off = PyOS_snprintf(buf, sizeof(buf), "MRO conflict among bases");
+ off = PyOS_snprintf(buf, sizeof(buf), "Cannot create class.\
+The superclasses have conflicting\n\
+inheritance trees which leave the method resolution order (MRO)\n\
+undefined for bases");
i = 0;
while (PyDict_Next(set, &i, &k, &v) && off < sizeof(buf)) {
PyObject *name = class_name(k);