Merge pull request #305 from nobu/c2x-pedantic #369

Job	Run time
ruby-versions / Generate Ruby versions	3s
ubuntu-latest 2.7	54s
ubuntu-latest 3.0	31s
ubuntu-latest 3.1	42s
ubuntu-latest 3.2	31s
ubuntu-latest 3.3	30s
ubuntu-latest debug	50s
ubuntu-latest head	34s
macos-latest 2.7	53s
macos-latest 3.0	24s
macos-latest 3.1	42s
macos-latest 3.2	1m 21s
macos-latest 3.3	21s
macos-latest debug	28s
macos-latest head	22s
macos-14 2.7	57s
macos-14 3.0	25s
macos-14 3.1	37s
macos-14 3.2	26s
macos-14 3.3	21s
macos-14 debug	30s
macos-14 head	26s
windows-latest 2.7	5m 43s
windows-latest 3.0	3m 13s
windows-latest 3.1	3m 54s
windows-latest 3.2	3m 37s
windows-latest 3.3	6m 23s
windows-latest head	3m 42s
windows-latest mingw	3m 19s
windows-latest mswin	1m 53s
	44m 32s

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