Merge pull request #540 from nobu/unused-variables #1049

Job	Run time
ruby-versions / Generate Ruby versions	3s
ubuntu-latest 3.4	52s
ubuntu-latest 3.2	55s
ubuntu-latest 3.0	53s
macos-latest 3.4	45s
ubuntu-latest 3.1	51s
macos-latest 3.0	41s
ubuntu-latest 4.0	49s
macos-latest 3.1	47s
macos-latest 4.0	56s
macos-latest 3.2	47s
ubuntu-latest head	47s
ubuntu-latest 3.3	46s
macos-14 3.0	35s
ubuntu-latest debug	53s
ubuntu-latest 2.7	1m 27s
macos-latest head	39s
macos-latest 2.7	1m 9s
macos-latest debug	33s
macos-latest 3.3	45s
windows-latest 3.3	2m 54s
macos-14 3.4	39s
windows-latest 2.7	3m 22s
macos-14 debug	33s
windows-latest mswin	2m 17s
windows-latest 3.4	2m 33s
macos-14 3.3	42s
macos-14 4.0	25s
macos-14 3.1	43s
macos-14 2.7	1m 34s
windows-latest mingw	1m 48s
macos-14 head	28s
windows-latest head	3m 14s
windows-latest 4.0	2m 56s
macos-14 3.2	30s
	40m 31s

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