I've just implemented a syntax extension that you might like: As of the 
newest development version, you'll now be able to assign multiple 
variables with a single #declare (or #local) statement, like so:

   #declare (A,B,C) = (X,Y,Z);

Obviously, this now allows for a single macro to return multiple items, 
like this:

   #macro WindowFrameAndCutout(Pos,H,W)
     #local Frame  = union {...};
     #local Cutout = box {...};
     (Frame,Cutout,Area)
   #end

   #declare (MyFrame,MyCutout) = WindowFrameAndCutout(...);

How's that? :D

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