Rust

Apply suggestions from code review #14422

Job	Run time
Format + check	2m 31s
Check wasm32 + wasm-bindgen	2m 56s
cargo-deny aarch64-apple-darwin	43s
cargo-deny aarch64-linux-android	51s
android	27s
Check wasm32+atomics	1m 36s
cargo-deny i686-pc-windows-gnu	44s
cargo-deny i686-pc-windows-msvc	42s
ios	29s
Run tests	3m 25s
cargo-deny i686-unknown-linux-gnu	43s
cargo-deny wasm32-unknown-unknown	44s
cargo-deny x86_64-apple-darwin	43s
Check Windows	1m 58s
cargo-deny x86_64-pc-windows-gnu	44s
cargo-deny x86_64-pc-windows-msvc	41s
cargo-deny x86_64-unknown-linux-gnu	42s
cargo-deny x86_64-unknown-linux-musl	39s
cargo-deny x86_64-unknown-redox	39s
	21m 57s

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