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-
-\ http://www.forth200x.org/defined.html
-\ adapted to non-counted strings
-
-: [defined] parse-name find-name dup if swap drop then ; immediate
-: [undefined] postpone [defined] 0= ; immediate
-
-\ ... and without postpone (Enoch, Feb-2013)
-\ : [defined] parse-name find-name if drop -1 else 0 then ; immediate
-\ : [undefined] parse-name find-name if drop 0 else -1 then ; immediate