This page is part of the web mail archives of SRFI 44 from before July 7th, 2015. The new archives for SRFI 44 contain all messages, not just those from before July 7th, 2015.
> 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. -- Grzegorz