test

Merge pull request #473 from ydah/use-empty #509

Job	Run time
check-misc (head)	7s
steep-check (head)	17s
test-ruby (head, master)	6m 3s
test-memory (head)	51s
test-ruby (3.0, master)	6m 14s
test-windows (head)	1m 36s
ruby-versions / Generate Ruby versions	3s
test (2.5)	27s
test-cpp (head, g++)	11s
test (2.6)	26s
test-cpp (head, clang++)	16s
test (2.7)	29s
test (3.0)	30s
test (3.1)	21s
test (3.2)	15s
test (3.3)	12s
test (head)	13s
	18m 31s

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