* David Barbour <dmbarbour@gmail.com> [2012-01-21 11:02:40-0800]

> On Sat, Jan 21, 2012 at 10:51 AM, David Menendez <dave@zednenem.com> wrote:
>
> > The Eval monad has the property: return undefined >>= const e = e.
> >
>
> You can't write `const e` in the Eval monad.

Why not?

ghci> runEval $ return undefined >>= const (return ())
()