mercurial/parsers.c

--- a/mercurial/parsers.c	Fri Aug 14 12:31:56 2015 +0900
+++ b/mercurial/parsers.c	Fri Aug 14 12:36:41 2015 +0900
@@ -1232,6 +1232,7 @@
 						if (val == NULL)
 							goto bail;
 						PySet_Add(reachable, val);
+						Py_DECREF(val);
 					}
 					Py_DECREF(p);
 				}