Add a case for failed Hash pattern match #17

Job	Run time
RuboCop	28s
specs (ubuntu, 3.0.6)	1m 29s
specs (ubuntu, 3.1.4)	1m 29s
specs (ubuntu, 3.2.2)	1m 24s
specs (ubuntu, 3.3.0)	1m 23s
specs (macos, 3.0.6)	1m 38s
specs (macos, 3.1.4)	1m 22s
specs (macos, 3.2.2)	1m 25s
specs (macos, 3.3.0)	1m 26s
specs (windows, 3.0.6)	3m 54s
specs (windows, 3.1.4)	5m 32s
specs (windows, 3.2.2)	5m 38s
specs (windows, 3.3.0)	5m 25s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 22s
	33m 55s

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