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Re: MacScheme+Toolsmith Version 1.0

   Selective linking is made possible by the clean design of
   Scheme, which maintains a rigorous distinction between program and data.
   It is impossible to write a reliable and effective selective linker for
   other dialects of Lisp, because they do not maintain this distinction.
   Peace, William Clinger

This is an intriguing statement. Can you amplify on this. Is it the use
of symbols both as first class objects and as names that causes the
problems or is it something else?