In other news, I really like Rust, but I don't understand why their Result type has the error on the right... doc.rust-lang.org/std/fs/struct.
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There's no incentive to do it the other way because be can't partially apply the type constructor as you do in Haskell for Functor/Monad/etc instances. The `T` seems more important so it goes first.
I mean, you could equally ask, 'why is Either in Haskell right biased?' 🙂