A good start on the macro idea

I call it macro because it lets you insert basically arbitrary risc code into the ruby level. The way it works:
Reserve namespace X
map any X.some_call to a Mom instruction
by the name SomeCall
which must take the same args in constructor as given
And obviously produce whatever risc it wants
Hoping to rewrite builtin around this idea (with the existing Mom builtn instructions)

lib/vool/return_statement.rb

@@ -17,13 +17,11 @@ module Vool
     # - store the given return value, this is a SlotMove
     # - activate return sequence (reinstantiate old message and jump to return address)
     def to_mom( compiler )
-      load = Mom::SlotLoad.new( self , [:message , :return_value] ,
-                        @return_value.to_slot(compiler) )
       if @return_value.is_a?(CallStatement)
         ret = @return_value.to_mom(compiler)
-        ret << load
+        ret << slot_load(compiler)
       else
-        ret = load
+        ret = slot_load(compiler)
       end
       ret << Mom::ReturnJump.new(self , compiler.return_label )
     end
@@ -31,5 +29,10 @@ module Vool
     def to_s(depth = 0)
       at_depth(depth , "return #{@return_value.to_s}")
     end
+
+    def slot_load(compiler)
+      Mom::SlotLoad.new( self , [:message , :return_value] ,
+                        @return_value.to_slot(compiler) )
+    end
   end
 end