Diagonalization/ dupe for monads and tuples?

Carter Schonwald carter.schonwald at gmail.com
Thu Sep 17 12:42:42 UTC 2020

Iā€™d expect fromEither to be
Either a b -> (a-> c )-> (b-> c) -> c

Nothing about the name fromEither is suggestive of the Either a a type

On Thu, Sep 17, 2020 at 3:45 AM Oliver Charles <ollie at ocharles.org.uk>

> Regardless of having a more abstract version, I'm +1 on Jon's suggestion,
> and those names. fromEither is something I have reached for many many times
> and been surprised it's not within arms reach.
> On Thu, 17 Sep 2020, at 7:16 AM, Jon Purdy wrote:
> Iā€™m strongly for these:
> Data.Tuple.dup :: a ā†’ (a, a)
> Data.Either.fromEither :: Either a a ā†’ a
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