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 <bugf...@gmail.com>: > 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? > > > > > > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe > > -- Eugene Kirpichov Web IR developer, market.yandex.ru _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
