On Thu, Oct 8, 2009 at 12:56 AM, Tom Hawkins <tomahawk...@gmail.com> wrote: > Known bugs: Occasionally HTZAAR throws a Prelude.head: empty list. > I'm still trying to track this down.
I used the following function to track down a similar problem: myhead :: String -> [a] -> a myhead msg [] = error msg myhead _ (x:_) = x Then you can replace your calls to head with myhead "bla". This way it is faster to pin-point which head is applied to an empty list. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
