Rust

Code style improvements and lint fixes. #152

Job	Run time
build	37s
linting	4s
cross-testing (stable, ubuntu-latest, default)	14s
cross-testing (stable, ubuntu-latest, with-serde)	33s
cross-testing (stable, windows-latest, default)	1m 9s
cross-testing (stable, windows-latest, with-serde)	1m 47s
cross-testing (stable, macos-latest, default)	24s
cross-testing (stable, macos-latest, with-serde)	23s
cross-testing (nightly, ubuntu-latest, default)	20s
cross-testing (nightly, ubuntu-latest, with-serde)	27s
cross-testing (nightly, windows-latest, default)	1m 10s
cross-testing (nightly, windows-latest, with-serde)	1m 7s
cross-testing (nightly, macos-latest, default)	34s
cross-testing (nightly, macos-latest, with-serde)	39s
cross-testing (1.41, ubuntu-latest, default)	27s
cross-testing (1.41, ubuntu-latest, with-serde)	26s
cross-testing (1.41, windows-latest, default)	43s
cross-testing (1.41, windows-latest, with-serde)	1m 16s
cross-testing (1.41, macos-latest, default)	24s
cross-testing (1.41, macos-latest, with-serde)	29s
	13m 13s

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