Supress warning: unused variable 'cls' #2497

Job	Run time
RuboCop	53s
specs (ubuntu, 3.4.9)	1m 38s
specs (windows, 4.0.4)	3m 53s
specs (windows, 3.4.9)	3m 2s
specs (ubuntu, 4.0.4, --repeat 2)	2m 16s
specs (windows, 3.3.11)	3m 16s
specs (ubuntu, 4.0.4, --enable-frozen-string-literal)	15m 50s
specs (ubuntu, 4.0.4, --parser=parse.y)	15m 50s
specs (ubuntu, 4.0.4, LC_ALL=C)	1m 30s
specs (macos, 3.4.9)	1m 23s
specs (macos, 3.3.11)	53m 41s
specs (macos, 4.0.4)	53m 41s
specs (ubuntu, 3.3.11)	15m 50s
specs (ubuntu, 4.0.4)	1m 35s
	2h 54m 18s

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