Hi Mark,
nested type, but to do that I seem to have to create a whole other near-copy of the data declarations with slightly different names and the occasional constructor missing. I wonder if there's a better way.
Instead of getting the type system to enforce it, you can write annotations that capture this restricted type. See: http://www.cl.cam.ac.uk/~nx200/research/escH-hw.ps http://www-users.cs.york.ac.uk/~ndm/projects/catch.php Note that neither of these tools are publically available, but I suspect both will be within a year or so. I'm hoping Catch will be much sooner. Thanks Neil _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
