test

Separate number and index in `Grammar::Reference` #1115

Job	Run time
steep-check (head)	13s
test-memory (head)	23s
check-misc (head)	7s
test-ruby (head, master)	5m 21s
test-windows (head)	2m 6s
test-ruby (3.0, master)	5m 12s
test-ruby (2.7, master)	5m 46s
ruby-versions / Generate Ruby versions	3s
test (2.5)	25s
test (2.6)	26s
test (2.7)	22s
test (3.0)	13s
test (3.1)	12s
test (3.2)	13s
test (3.3)	9s
test (head)	17s
	21m 28s

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