chain: extend fn MSRV #16

Job	Run time
build (ubuntu-latest, 1.63.0)	2m 46s
build (ubuntu-latest, stable)	1m 45s
build (ubuntu-latest, beta)	1m 42s
build (ubuntu-latest, nightly)	1m 40s
build (macos-latest, 1.63.0)	1m 55s
build (macos-latest, stable)	1m 12s
build (macos-latest, beta)	1m 17s
build (macos-latest, nightly)	1m 9s
build (windows-latest, 1.63.0)	4m 6s
build (windows-latest, stable)	2m 19s
build (windows-latest, beta)	2m 39s
build (windows-latest, nightly)	2m 42s
	25m 12s

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