refactor(lib): resolve unused warning #2191

Job	Run time
Check Style	19s
Verify hyper.h is up to date	44s
Test stable on ubuntu-latest	1m 57s
Test stable on windows-latest	4m 36s
features	32s
Test stable on macOS-latest	2m 17s
Test C API (FFI)	55s
Test with Miri	1m 28s
Test beta on ubuntu-latest	2m 2s
Check MSRV	4m 56s
Test beta on windows-latest	2m 48s
Test beta on macOS-latest	2m 57s
udeps	34s
Test nightly on ubuntu-latest	2m 4s
Test nightly on windows-latest	3m 54s
Test nightly on macOS-latest	2m 48s
Check exposed types	38s
Build docs	33s
CI is green	1s
	36m 3s

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