fixing missing errors definition (#281) #465

Job	Run time
test_matrix (ubuntu, 2.5)	26s
test_matrix (ubuntu, 2.6)	28s
test_matrix (ubuntu, 2.7)	24s
test_matrix (ubuntu, 3.0)	15s
test_matrix (ubuntu, 3.1)	13s
test_matrix (ubuntu, 3.2)	12s
test_matrix (ubuntu, 3.3)	9s
test_matrix (ubuntu, head)	11s
test_matrix (ubuntu, truffleruby)	34s
test_matrix (ubuntu, truffleruby-head)	42s
test_matrix (ubuntu, jruby)	50s
test_matrix (ubuntu, jruby-head)	52s
test_matrix (macos, 2.5)	6s
test_matrix (macos, 2.6)	34s
test_matrix (macos, 2.7)	30s
test_matrix (macos, 3.0)	17s
test_matrix (macos, 3.1)	18s
test_matrix (macos, 3.2)	24s
test_matrix (macos, 3.3)	19s
test_matrix (macos, head)	22s
test_matrix (macos, truffleruby)	36s
test_matrix (macos, truffleruby-head)	38s
test_matrix (macos, jruby)	36s
test_matrix (macos, jruby-head)	38s
finish	0s
	10m 34s

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