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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 comm

by rlmw 16y ago

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.

jdh30 16y ago
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.