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Re: AW: Various comments

> Many modern schemes return a special value labeled "undefined",
> which it is an error to refer to or store.  But I think MITscheme
> still does the old-school value returns.

In what scheme is it an error to store the undefined value?
I've just tried 
(define undefined (if #f #f))
in Gauche, MzScheme and Sisc and none signalled an error.