allow `puts` without argument #1716

Job	Run time
ruby-versions / Generate Ruby versions	2s
test (2.7)	1m 59s
test (3.0)	1m 59s
test (3.1)	1m 41s
test (3.2)	1m 43s
test (3.3)	1m 36s
test (debug)	4m 54s
test (head)	1m 32s
	15m 26s

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