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+Sun Nov  6 00:03:09 2016  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* configure.in (-Wimplicit-fallthrough): gcc7 introduces case
+	  fall through warnings but it is too noisy.
+	  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=7652
+
 Sat Nov  5 23:58:32 2016  Shugo Maeda  <shugo@ruby-lang.org>
 
 	* numeric.c (rb_int_round): cast to SIGNED_VALUE to suppress