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Re: Reintroducing old `defined?'

>>>>> "Jost" == Jost Boekemeier <jostobfe@calvados.zrz.TU-Berlin.DE> writes:

    Jost> Keith Wright <> writes:

    Jost> (define (b) (display a)) (define a 12) (b) -> 12

    Jost> (undefine a) a -> ERROR (b) -> value "undefined"
    Jost>                               ^^^^^^^^^^^^^^^^^ WRONG!

That looks like a bug in the evaluator, not a problem with undefine.

    Jost> Doesn't `(environment-bound? (car (the-environment)) <sym>)'
    Jost> do what you want?  (See Jim Blandy's environment proposal).

Ouch! I hope that's going to be hidden!  

I think "define", "undefine", and "defined?" make sense even without a
module system.