Rust

Make enum generate by `VariantDiscriminant` derive macro implement `Ord + PartialOrd` #283

Job	Run time
Check	18s
Rust Info	1s
Rustfmt	15s
Clippy	14s
Compile and test with minimal versions	22s
Verify minimal supported rust version	24s
Test Suite	1m 50s
	3m 24s

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