Big oops: macfs has always been using a private exception but calling it mac.error.
It now uses MacOS.Error (the OSErr valued error) and advertises that too. This
fix shouldn't break anything, I guess.
diff --git a/Mac/Modules/macfsmodule.c b/Mac/Modules/macfsmodule.c
index 2c0c8e1..0db4022 100644
--- a/Mac/Modules/macfsmodule.c
+++ b/Mac/Modules/macfsmodule.c
@@ -979,7 +979,7 @@
/* Add some symbolic constants to the module */
d = PyModule_GetDict(m);
- ErrorObject = PyErr_NewException("macfs.error", NULL, NULL);
+ ErrorObject = PyMac_GetOSErrException();
PyDict_SetItemString(d, "error", ErrorObject);
Mfsatype.ob_type = &PyType_Type;