Re: [Haskell-cafe] Partial pattern matching

P x is indistinguishable neither in compile-time nor in run-time from the value \y -> P x y. And pattern matching and equality on functions is, of course, undecidable. 2009/3/9 Peter Verswyvelen :

In Haskell, a data constructor can be used partially applied: data Pair a b = P a b f = P 1 however, I cannot do "partial pattern matching", e.g firstCoord (P x) = x does not work. I guess a very important reason must exist why this is the case?

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