The following macro, and its application, cause POV 3.1 to generate 
a warning:

   #macro plus(X,Y)
     X+Y
   #end

   sphere { <0,0,0>, plus(3,4) pigment { color <1,1,1> } }

The warning reads:

All #version and #declares of float, vector, and color require 
semi-colon ';' at end.

Apparently not what one wants.

Regards,  RobW
-- 
+------------------------------------------------------+
| Rob Wieringa                                         |
| Philips  Research  Laboratories   Eindhoven          |
| <remove _XXXXX_ from email address..>                |
| email: _XXX### [at] natlabresearchphilipscom   |
+------------------------------------------------------+

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