[Haskell] View patterns in GHC: Request for feedback

Hi everyone, Simon PJ and I are implementing view patterns, a way of pattern matching against abstract datatypes, in GHC. Our design is described here: http://hackage.haskell.org/trac/ghc/wiki/ViewPatterns If you have any comments or suggestions about this design, we'd love to hear them. You can respond to this list (and we can take it to haskell-cafe if the thread gets long) or, if you prefer, directly to me. Thanks! -Dan