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Re: `undefine' bug or feature? writes:
> Jost Boekemeier writes:
>  > (define a 1)
>  > (define (l) (display a))
>  > (l) -> 1
>  > 
>  > (undefine a)
>  > (l) -> #<undefined>
>  > 
>  > 
>  > I think it is better to let `undefine' remove the symbol completely instea
> d
>  > of setting its value to undefined.
> what do you mean by "remove completely"?  in the above example, `l' is
> already defined, and its symbol `a' exists for it.  how can you make `l'
> forget about `a'?

The last call to `l' should, in my opinion at least, have the same
result as if `a' had never been defined at all, i.e. an unbound
variable error when you try to call it.

 - Maciej Stachowiak