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+Thu Dec  2 09:30:06 2004  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* eval.c (thread_mark): mark thread group.  [ruby-dev:25020]
+
+	* eval.c (thgroup_add): check whether the argument is really a Thread.
+
 Tue Nov 30 23:38:18 2004  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* io.c (io_fread): need not to null terminate.  [ruby-dev:24998]