[Haskell-cafe] Short circuiting and the Maybe monad

[Andrew Coppin]

Janis Voigtlaender wrote:
> http://wwwtcs.inf.tu-dresden.de/~voigt/mpc08.pdf

"It is well-known that trees with substitution form a monad."

...OK, I just learned something new. Hanging around Haskell Cafe can be 
so illuminating! :-)

Now, if only I could actually comprehend the rest of the paper... o_O