#-------------------------------------------------------------------#
|   Preprocessor / #define macros                                   |
#-------------------------------------------------------------------#


   Differences compared with EC/CreativE:


      o Null-arg macros are supported

         Example: #define BLA() ..stuff..


      o Variable arguments are supported

         Example: #define Bla(x,y,...) [1,2,x,y,...,NIL]

         Note: If "..." in body is immediately preceded by "," (as in above example),
               The "," will get removed automatically if the "..." argument is empty.


      o Defines may be exported explicitly:

         EXPORT #define ...