Fix Rubocop warnings #2473

Job	Run time
RuboCop	47s
specs (ubuntu, 3.4.9)	1m 33s
specs (ubuntu, 4.0.4, --parser=parse.y)	1m 32s
specs (ubuntu, 4.0.4, LC_ALL=C)	1m 32s
specs (ubuntu, 3.3.11)	1m 32s
specs (ubuntu, 4.0.4)	1m 29s
specs (macos, 4.0.4)	1m 47s
specs (macos, 3.4.9)	1m 46s
specs (ubuntu, 4.0.4, --repeat 2)	2m 11s
specs (windows, 4.0.4)	3m 49s
specs (windows, 3.3.11)	3m 23s
specs (ubuntu, 4.0.4, --enable-frozen-string-literal)	1m 28s
specs (macos, 3.3.11)	1m 52s
specs (windows, 3.4.9)	3m 11s
	27m 52s

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