[Haskell-cafe] Problem with own written monad

[Derek Elkins]

On Mon, 2008-01-07 at 18:21 +0000, Paul Johnson wrote:
> Miguel Mitrofanov wrote:
> >
> > Yes. It's simply impossible. The Stack data type can't be turned into 
> > a monad.
> Why not?  Surely this is just a variation on the theme of a state monad?

I somewhat explain in this reply:
http://www.haskell.org/pipermail/haskell-cafe/2008-January/037605.html