an example use of the new "$()" feature

data/scenario-test.cfg

@@ -928,6 +928,33 @@ Ww, Ww, Ww, Ww
 
     [event]
         name=start
+        [set_menu_item]
+            id=test0
+            description="Perform Calculation"
+            [filter_location]
+                [filter]
+                    has_weapon=missile
+                [/filter]
+            [/filter_location]
+            [command]
+                [message]
+                    speaker=unit
+                    message="I will prepare the incantation; what dost thou desire to know?"
+                    [text_input]
+                        label="Formula="
+                        variable="formula"
+                    [/text_input]
+                [/message]
+                [message]
+                    speaker=narrator
+                    message="Formula:
+#    $formula
+Result:
+@    $(debug_print( 'Result: ', $formula ))
+"
+                [/message]
+            [/command]
+        [/set_menu_item]
         [set_menu_item]
             id=test1
             description="Summon Troll"