Hello, from time to time request for Haskell running on top of Java's VM pops on the haskell related mailing list and then usually dies off when someone mentions that JDK does not have proper support for tail-calls. I think haskell community might do something with this fact or at least attempt to do something with it. I think the proper request for enhancement is here: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6804517 if you agree with it (as it's proposed on the rfe's mentioned blog article[1]), then please either join or if you are already a member of SDN then just login and vote for this bug. That's something we can do for free and will take just few minutes yet perhaps push a little bit more weight behind this bug (err, just 4 votes now, why's that?). Thanks, Karel [1]: http://blogs.sun.com/jrose/entry/tail_calls_in_the_vm