Merge pull request #490 from sasezaki/patch-1 #568

Job	Run time
cs-stan / Coding Standard & Static Analysis	28s
testsuite / testsuite-linux (8.2, highest, false)	16s
testsuite / testsuite-linux (8.4, highest, false)	14s
testsuite / testsuite-linux (8.3, highest, false)	17s
testsuite / testsuite-linux (8.2, lowest, false)	17s
testsuite / testsuite-linux (8.5, highest, false)	15s
	1m 47s

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