test

Fix a Ruby::AnnotationSyntaxError #519

Job	Run time
steep-check (head)	30s
test-memory (head)	31s
test-ruby (head, master)	6m 2s
check-misc (head)	8s
test-ruby (3.0, master)	6m 1s
test-windows (head)	1m 57s
ruby-versions / Generate Ruby versions	2s
test-cpp (head, g++)	13s
test (2.5)	31s
test-cpp (head, clang++)	16s
test (2.6)	29s
test (2.7)	29s
test (3.0)	16s
test (3.1)	14s
test (3.2)	22s
test (3.3)	15s
test (head)	16s
	18m 32s

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