test

_1 is not provided in Ruby 2.5 #168

Job	Run time
ruby-versions / Generate Ruby versions	2s
build (2.5 / ubuntu-latest)	20s
build (2.5 / windows-latest)	2m 36s
build (2.6 / ubuntu-latest)	21s
build (2.6 / macos-latest)	32s
build (2.6 / windows-latest)	3m 3s
build (2.7 / ubuntu-latest)	20s
build (2.7 / macos-latest)	30s
build (2.7 / windows-latest)	1m 48s
build (3.0 / ubuntu-latest)	10s
build (3.0 / macos-latest)	13s
build (3.0 / windows-latest)	1m 39s
build (3.1 / ubuntu-latest)	7s
build (3.1 / macos-latest)	11s
build (3.1 / windows-latest)	1m 17s
build (3.2 / ubuntu-latest)	20s
build (3.2 / macos-latest)	12s
build (3.2 / windows-latest)	1m 25s
build (3.3 / ubuntu-latest)	6s
build (3.3 / macos-latest)	9s
build (3.3 / windows-latest)	2m 18s
build (head / ubuntu-latest)	7s
build (head / macos-latest)	11s
build (head / windows-latest)	2m 9s
build (mswin / windows-latest)	1m 11s
	21m 17s

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