Alfonso Acosta wrote: > I haven't tried to run the code, but my first bet is that, due to the > rank-2 polymorphism of ST, you should use parenthesis instead of $ in > the case of runST.
Perhaps if Andrew is using an old compiler. That is no longer a problem in recent versions of GHC. A more basic issue is that fn is in the IO monad, but its use inside the mapM will need it to be in the ST monad. Regards, Yitz _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
