felix <felix@anu.ie> wrote:
+---------------
| brlspam@sperience.com wrote in message ...
| >Tell me if you can predict what the value of the following expression
| >is, then we'll talk about what is and isn't well-known.
| >
| >(let ()
| >  (define x 1)
| >  (define y (+ x 1))
| >  y)
| 
| The value of this expression is not clearly defined.
+---------------

Specifically, since the above is just [R5RS 5.2.2] syntactic sugar for:

   (let ()
     (letrec ((x 1)
	      (y ((+ x 1))))
       y))

...it violates the R5RS restrictions (4.2.2, 5.2.2) on assigning or
referencing variables bound with "letrec" during the evaluation of
the initial value.


-Rob

-----
Rob Warnock, 41L-955		rpw3@sgi.com
Applied Networking		http://reality.sgi.com/rpw3/
Silicon Graphics, Inc.		Phone: 650-933-1673
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