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

[Tomasz Zielonka]

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