On Sun, 26 Dec 2010, Antoine Latter wrote:
I haven't had a chance to dig into your example, but you might want to try the maybeT library: http://hackage.haskell.org/package/MaybeT That way you could try to narrow down where the error is coming from.
MaybeT is also part of transformers library now. http://hackage.haskell.org/packages/archive/transformers/0.2.2.0/doc/html/Control-Monad-Trans-Maybe.html _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
