[racket] confusion about shadowing predefined functions in interactions window

On 10/22/12 10:05 PM, Dan Grossman wrote:
> (define (range lo hi)
>      (print "hi")
>      (if (> lo hi) null (cons lo (range (+ 1 lo) hi))))
...
> I apologize if this is a known "feature" or a known "bug" -- I do scan
> the release notes briefly when new versions come out, but don't remember
> anything about this.  Any pointers?  Thanks!

Because I can't do it justice, I will let someone else provide the 
answer as to why this does what it does (which is an instance of "the 
top-level is hopeless"), but I just want to point out that I showed this 
example to two members of the PLT team and asked them to predict how 
many times "hi" would be printed.

They both predicted wrong.

David