On Fri, Apr 13, 2012 at 7:49 AM, Johannes Waldmann < waldm...@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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