> What does this mean and how do I make it compile?
>
> mapl{|a, b|arr|} :: (mapl{|a, b|arr|}, ArrowChoice arr, BiArrow arr) => arr a
> b
It's Generic Haskell source code, see
http://www.generic-haskell.org/
Generic Haskell is an extension of Haskell that supports generic programming.
Cheers, Ralf
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