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+Sun Jul 14 00:17:42 2013  Tanaka Akira  <akr@fsij.org>
+
+	* bignum.c (big_shift): Avoid signed integer overflow.
+
 Sun Jul 14 00:14:15 2013  Tanaka Akira  <akr@fsij.org>
 
 	* bignum.c (bary_mul_precheck): Use bary_small_lshift or