Michael Shulman wrote: > > class MonadList m where > option :: [a] -> m a [...]
There's no need for an extra class, it can be done with MonadPlus: option :: MonadPlus m => [a] -> m a option = msum . map return This definition came up before, for example here: http://www.haskell.org/haskellwiki/Sudoku enjoy, Bertram _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
