On Thu, 5 Sep 2002, Alan Chen wrote:
> On Fri, Sep 06, 2002 at 02:08:19AM +0900, Tobias Peters wrote:
> >   def sqrt(x)
[...]
> >     def o.improve(guess)
> >       average(guess, x/guess)
> >     end
> >     def o.sqrt_iter(g1,g2)
> >       good_enough(g1,g2) ? g2 : sqrt_iter(g2, improve(g2))
> >     end
> >     o.sqrt_iter(1.0, 2.0)
> >   end

This was an error -- nested defs are not lexical closures, as it turns
out, so this fails when evaluating x in "improve".

> Most defs within defs can also be resolved using procs.

This was the starting point (using lambda instead of proc). I wanted to 
replace the [] with ().

  Tobias