Re: or evaluates second argument if first is true?

[Jim White <jim at pagesmiths dot com>]

No, or does do "short circuit" evaluation.

Khairul Azhar wrote:
> I've been trying to do the following for my top-level ala Python: -
>
> (if (or (not (environment-bound? (interaction-environment) '__main__))
> 	__main__)
>     (display "Executing main procedure"))
>
> Boom! I get an UnboundSymbol exception (which, incidentally, is triggered
> on the (if...) line) for __main__.
That is because (environment-bound? (interaction-environment) '__main__) 
is returning #t even though evaluating __main__ results in Unbound Symbol.

> The questions are: Should this work? Will this work? Or should I go about
> this some other way e.g. using define-variable perhaps?
Don't know.  There must be something special about __main__, since foo 
works as expected.

jim