Nicholas Nethercote 10144e29af Handle tags better. ... Currently, for the enums and comparison traits we always check the tag for equality before doing anything else. This is a bit clumsy. This commit changes things so that the tags are handled very much like a zeroth field in the enum. For `eq`/ne` this makes the code slightly cleaner. For `partial_cmp` and `cmp` it's a more notable change: in the case where the tags aren't equal, instead of having a tag equality check followed by a tag comparison, it just does a single tag comparison. The commit also improves how `Hash` works for enums: instead of having duplicated code to hash the tag for every arm within the match, we do it just once before the match. All this required replacing the `EnumNonMatchingCollapsed` value with a new `EnumTag` value. For fieldless enums the new code is particularly improved. All the code now produced is close to optimal, being very similar to what you'd write by hand.		2022-07-11 16:58:32 +10:00
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src	Handle tags better.	2022-07-11 16:58:32 +10:00
Cargo.toml	Update smallvec to 1.8.1.	2022-06-27 08:48:55 +10:00