[plt-scheme] behaviour of void?

[Matthias Felleisen]

On Feb 3, 2009, at 7:01 PM, Prabhakar Ragde wrote:

> Code:
>
> (define x 2)
> (void? (set! x 3))
>
> In Advanced Student: produces `false'.
> In Module (with addition of #lang scheme): produces #t.
>
> Why?

Bug.

>
> Thanks.
>
> (Not my question. I don't cover `void?', because I don't see much  
> point to it, and I skip over Advanced Student to get to Module.  
> Asked by people teaching the non-major course.) --PR

Tell them not to use void?. Tell them not to cover chapters VII and  
VIII. Instead have students work on large projects and spend lectures  
on iterative refinement and re-doing projects. -- Matthias