allow `puts` without argument #1717

Job	Run time
ruby-versions / Generate Ruby versions	3s
test (2.7)	2m 0s
test (3.0)	1m 54s
test (3.1)	1m 55s
test (3.2)	1m 33s
test (3.3)	1m 45s
test (debug)	4m 46s
test (head)	1m 32s
	15m 28s

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