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diff --git a/ChangeLog b/ChangeLog
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@@ -1,3 +1,11 @@
+Mon Jun 17 11:50:29 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* gc.c (gc_mark_maybe): added. check `is_pointer_to_heap()' and
+	  type is not T_ZOMBE.
+
+	* gc.c: use `gc_mark_maybe()'. T_ZOMBIE objects should not be pushed
+	  to the mark stack.
+
 Mon Jun 17 07:56:24 2013  Tanaka Akira  <akr@fsij.org>
 
 	* bignum.c (bary_small_lshift): Renamed from bdigs_small_lshift.