Merge pull request #853 from shaicoleman/remove-ostruct #353

Job	Run time
lint	10s
test (3.3, 7.2, --enable-frozen-string-literal)	2m 58s
test (3.3, 7.1, --enable-frozen-string-literal)	2m 52s
test (3.3, 7.0, --enable-frozen-string-literal)	1m 10s
test (3.3, 6.1, --enable-frozen-string-literal)	1m 12s
test (3.2, 7.2)	1m 4s
test (3.2, 7.1)	1m 11s
test (3.2, 7.0)	1m 7s
test (3.2, 6.1)	1m 2s
test (3.1, 7.1)	2m 48s
test (3.1, 7.0)	1m 9s
test (3.1, 6.1)	1m 10s
test (3.0, 7.0)	1m 17s
test (3.0, 6.1)	1m 3s
test (jruby-9.4.5.0, 7.0)	3m 54s
test (2.7, 7.0)	1m 18s
test (2.7, 6.1)	2m 54s
test (2.7, 6.0)	3m 1s
test (jruby-9.3.10.0, 6.1)	3m 36s
test (2.6, 5.2)	1m 46s
	36m 42s

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