in ghci: NLP.Clustering> let x = 5x {| Int |} *** Exception: typecheck/TcExpr.lhs:168: Non-exhaustive patterns in function tcMonoExpr i have no idea what {| and |} do, but i was messing around with them and typed this in by accident and it raised an exception. fyi. -- Hal Daume III "Computer science is no more about computers | hdaume@isi.edu than astronomy is about telescopes." -Dijkstra | www.isi.edu/~hdaume