Rust

Merge pull request #209 from WizardOfMenlo/recmo/update-spongefish #639

Job	Run time
Cargo fmt	22s
Build & Test (--features parallel)	2m 53s
Build & Test (--no-default-features)	2m 26s
Clippy (--no-default-features)	1m 47s
Clippy (--features parallel)	1m 46s
	9m 14s

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