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Jost Boekemeier <email@example.com.TU-Berlin.DE> writes: > Keith Wright <firstname.lastname@example.org> writes: > > > > Ok "undefine" is > > > not yet standardized either, but should be considered being > > > standardized in the scheme standard as well, as non essential. > > Does r5rs mention `undefine' at all? I don't like undefine because > it is hard to implement: > > (define (b) (display a)) > (define a 12) > (b) -> 12 > > (undefine a) > a -> ERROR > (b) -> value "undefined" > ^^^^^^^^^^^^^^^^^ WRONG! This should be considered a bug. It should be fixed when we have the new module system. (Use unmemoization.) /mdj