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Mark Hamburg wrote:
> 	in pushenv( t ) do

IMHO, pushenv should be the default behaviour of in-do-end.
In other words, in-do-end should nest.  I think, that would
be the most common use and when handled by the VM, it won't
cost a memory allocation for each in-do-end.

Of course, there has to be a method to tell in-do-env that
searching should not go further up, i.e. a function 'sandbox'
that inhibits further search:

in sandbox { pr = print, b=2 } do
  pr(a,b,c) --> nil 2 nil
  in { c=3 } do
    pr(a,b,c) --> nil 2 3

Ciao, ET.