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[plt-scheme] append!?

From: Pierpaolo Bernardi (olopierpa at gmail.com)
Date: Sat Oct 20 13:16:12 EDT 2007		 
On 10/20/07, Majorinc, Kazimir <kazimir at chem.pmf.hr> wrote:
> (append! x y) results in concatenation of the values of x and y.
> But, is it guaranteed that result is stored in x? I've read something
> like that in Help Desk, but I'm still not completely without doubt. Do I
> need to write (set! x (append! x y))

yes

| or (append! x y) is always enough?

no
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