--- a/mercurial/parsers.c Wed Aug 12 17:01:50 2015 -0500 +++ b/mercurial/parsers.c Thu Aug 13 17:58:33 2015 +0900 @@ -1144,7 +1144,7 @@ includepath = 1; /* Initialize return set */ - reachable = PySet_New(0); + reachable = PySet_New(NULL); if (reachable == NULL) { PyErr_NoMemory(); goto bail;