Add a case for failed Hash pattern match #16

Job	Run time
specs (ubuntu, 3.0.6)	1m 32s
RuboCop	27s
specs (ubuntu, 3.1.4)	1m 30s
specs (ubuntu, 3.2.2)	1m 28s
specs (ubuntu, 3.3.0)	1m 23s
specs (macos, 3.0.6)	1m 28s
specs (macos, 3.1.4)	1m 35s
specs (macos, 3.2.2)	1m 23s
specs (macos, 3.3.0)	2m 25s
specs (windows, 3.0.6)	5m 49s
specs (windows, 3.1.4)	7m 40s
specs (windows, 3.2.2)	6m 40s
specs (windows, 3.3.0)	6m 58s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 24s
	41m 42s

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