challenge: implement the max function

[Luís Marques]

Andrei Alexandrescu (See Website For Email) wrote:
> Here's a simple challenge: implement the max function. Requirements:

This is a very good challenge. I'm glad you started this thread.

Also, let's have some more of them down the line. It would be great if 
the conclusions were noted, to serve as a kind of language benchmark. 
Something to remind people of how much some simple things could still be 
better.

Luís