test

Add definition for Read sets and Follow sets #568

Job	Run time
test-memory (head)	54s
steep-check (head)	24s
check-misc (head)	15s
test-ruby (head, master)	6m 15s
test-windows (head)	2m 33s
test-ruby (3.0, master)	6m 28s
ruby-versions / Generate Ruby versions	3s
test-cpp (head, g++)	12s
test-cpp (head, clang++)	18s
test (2.5)	28s
test (2.6)	29s
test (2.7)	30s
test (3.0)	14s
test (3.1)	17s
test (3.2)	18s
test (3.3)	17s
test (3.4)	21s
test (head)	11s
	20m 27s

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