> http://darcs.haskell.org/packages/cgi-undecidable/ > > There only 3 or 4 lines of source code, but it can't be installed. > > The ghc version is 6.6 . > > Undecidable.hs:23:0: > Duplicate instance declarations: > instance [overlap ok] (MonadTrans t, MonadCGI m, Monad (t m)) => > MonadCGI (t m) > -- Defined at Undecidable.hs:23:0 > instance [overlap ok] (MonadTrans t, MonadCGI m, Monad (t m)) => > MonadCGI (t m) > -- Defined in Network.CGI.Monad
You probably have an old version of the cgi package, which contained the above instance declaration before it was moved to cgi-undecidable. Hence the "duplicate instance declaration" message. Try updating your cgi package first. _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
