variable lookup isn't checking undefined?

[dyoo]

(local [(define a (+ b 42)) (define b 17)]) (list a b))

isn't producing the error it should. It should say "local variable used before its definition".

[dyoo]

We are now matching behavior in Racket. I'm seeing the following error when evaluating the above code:

+: expected number as argument 1 but received #<undefined>

which is what we should be doing.