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Thanks for the correction. I admit I've not fiddled with Haskell's equivalents to Active Patterns to any great extent - as since I mention in the original comment I didn't hugely see the motivation in that context. I really only mentioned them since I assumed more people would be familiar with haskell.

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Haskell doesn't have active patterns. Although they were originally proposed for Haskell by Wadler, they don't make so much sense with non-strict evaluation because you can just write code to compute the result and match over it safe in the knowledge that it will be computed on-demand only as far as required.

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