Re: [Haskell-cafe] No Enum for (,), no Enum or Bounded for Either

One issue is that (Int, Int) is too big to define toEnum/fromEnum. On 06/01/2018 02:10 PM, Tom Ellis wrote:

I'm a bit surprised that whilst `Either` and `(,)` have instances for `Ord`

* `(,)` has no instance for `Enum` * `Either` has no instance for `Enum` or `Bounded`

Is there a particular reason for that? It might be tricky to implement

toEnum :: Int -> a fromEnum :: a -> Int

but in the presence of `Bounded` that should be possible.

Tom

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