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+Sat Nov 10 23:02:31 2012  Narihiro Nakamura  <authornari@gmail.com>
+
+	* gc.c: move immutable fields from struct heaps_slot and struct
+	  sorted_heaps_slot into struct heaps_header.
+	  Based on a patch from Sokolov Yura [Feature #6199][ruby-core:43592]
+
 Sat Nov 10 19:28:16 2012  Tadayoshi Funaba  <tadf@dotrb.org>
 
 	* complex.c: modified doc.