test

Check `grammar` directory and fix some types #1346

Job	Run time
check-misc (head)	8s
steep-check (head)	19s
test-memory (head)	8s
test-ruby (head, master)	5m 57s
test-windows (head)	2m 2s
test-ruby (3.0, master)	5m 54s
ruby-versions / Generate Ruby versions	3s
test (2.5)	26s
test (2.6)	23s
test (2.7)	29s
test (3.0)	13s
test (3.1)	17s
test (3.2)	15s
test (3.3)	12s
test (head)	13s
	16m 59s

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