> The built-in ability to pattern match on data nested > deeply within the application state (or the XML document) > is radica

> The built-in ability to pattern match on data nested > deeply within the application state (or the XML document) > is radically powerful. Haskell, for example, has nothing > like this. Now I'm puzzled because I know that you know about lenses, so you must mean something different by "pattern match on data nested deeply" and I'm wondering what. Could you expand?