Re: [Haskell-cafe] Re: The danger of Monad ((->) r)

On Tue, May 15, 2007 at 06:55:11AM -0700, Conal Elliott wrote:

You could also use mappend instead of concatStmts and keep the Database -> IO () representation. - Conal

You mean using the (Monoid b) => Monoid (a -> b) instance ? I can see that IO () makes a perfect Monoid, but there doesn't seem to be a standard instance for that. Pozdrawiam Tomek