[Haskell-cafe] is this an arrow?

[Daniel Peebles]

On Fri, Apr 13, 2012 at 7:49 AM, Johannes Waldmann <
waldmann at imn.htwk-leipzig.de> wrote:

> type Computer a b =  ( a -> IO ( Maybe b ) )
> type Transformer a b c d =  Computer a ( b, c -> d )


Computer looks like Kleisli (MaybeT IO), which would be a valid instance of
Arrow.
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