chore(tokio): warn on dead code (#168) #537

Job	Run time
Check Style	11s
semver	2m 33s
Check MSRV (1.63)	2m 43s
Test with Miri	49s
features	48s
Test stable on ubuntu-latest	41s
Test stable on windows-latest	1m 23s
Test stable on macos-latest	48s
Test beta on ubuntu-latest	35s
Test beta on windows-latest	1m 18s
Test beta on macos-latest	39s
Test nightly on ubuntu-latest	32s
Test nightly on windows-latest	1m 31s
Test nightly on macos-latest	38s
Build docs	13s
CI is green	1s
	15m 23s

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