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Keith Wright <email@example.com> 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! So I think it would be better to drop `undefine' completely. > DEFINED? Doesn't `(environment-bound? (car (the-environment)) <sym>)' do what you want? (See Jim Blandy's environment proposal). Jost