John Goerzen wrote: > One thing that bugs me about Haskell is that exceptions are not > extensible. > > I don't know how to craft a good solution, but perhaps if I explain the > problem well, someone would come up with one. Open datatypes would be the best solution, I think. http://www.informatik.uni-bonn.de/~loeh/OpenDatatypes.pdf -- Ashley Yakeley Seattle, WA