address clippy on windows #248

Job	Run time
windows-test (nightly, x86_64-pc-windows-gnu)	56s
windows-test (nightly, i686-pc-windows-gnu)	1m 35s
windows-test (stable, x86_64-pc-windows-gnu)	1m 57s
windows-test (stable, i686-pc-windows-gnu)	1m 33s
cross-ios-build (nightly, aarch64-apple-ios)	16s
bare-cross-build (nightly, x86_64-unknown-haiku)	27s
cross-ios-build (nightly, x86_64-apple-ios)	13s
native-test (nightly, ubuntu-latest)	16s
bare-cross-build (nightly, x86_64-unknown-openbsd)	25s
cross-ios-build (stable, aarch64-apple-ios)	8s
native-test (nightly, windows-latest)	42s
bare-cross-build (nightly, x86_64-unknown-redox)	24s
cross-ios-build (stable, x86_64-apple-ios)	9s
bare-cross-build (nightly, x86_64-fuchsia)	26s
bare-cross-build (nightly, wasm32-unknown-unknown)	23s
native-test (nightly, macOS-latest)	21s
native-test (stable, ubuntu-latest)	9s
native-test (stable, windows-latest)	2m 5s
native-test (stable, macOS-latest)	15s
native-test (1.56.0, ubuntu-latest)	2m 1s
native-test (1.56.0, windows-latest)	2m 37s
native-test (1.56.0, macOS-latest)	1m 54s
	19m 12s

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