http://hackage.haskell.org/package/base-4.6.0.1/docs/Debug-Trace.html http://hackage.haskell.org/package/base-4.6.0.1/docs/Debug-T... is what you want to use fo

http://hackage.haskell.org/package/base-4.6.0.1/docs/Debug-Trace.html http://hackage.haskell.org/package/base-4.6.0.1/docs/Debug-T... is what you want to use for emitting debug text or debug data dumps.