Merge pull request #1149 from okuramasafumi/coverage-with-begin #1666

Job	Run time
RuboCop	26s
specs (ubuntu, 3.0.6)	1m 29s
specs (ubuntu, 3.1.4)	1m 32s
specs (ubuntu, 3.2.2)	1m 27s
specs (ubuntu, 3.3.0)	1m 24s
specs (macos, 3.0.6)	1m 22s
specs (macos, 3.1.4)	1m 21s
specs (macos, 3.2.2)	1m 11s
specs (macos, 3.3.0)	1m 10s
specs (windows, 3.0.6)	4m 35s
specs (windows, 3.1.4)	4m 31s
specs (windows, 3.2.2)	3m 59s
specs (windows, 3.3.0)	3m 44s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 21s
	29m 32s

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