Fix nightly clippy lints. #852

Job	Run time
Rust check	24s
Rust format	16s
Rust doc	1m 29s
Rust check (macos-latest)	49s
Rust check with default features	22s
Rust lint (beta)	26s
Rust lint (nightly)	26s
Rust lint	44s
Rust check (windows-latest)	1m 31s
Rust lint (stable)	22s
Rust test	2m 3s
	8m 52s

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