Prefer empty parentheses instead of nil in Jumpmaze domain

Maumagnaguagno · Jan 24, 2018 · aaf3177 · aaf3177
1 parent 364a95a
commit aaf3177
Showing 1 changed file with 4 additions and 4 deletions.
diff --git a/examples/jumpmaze/jumpmaze.ujshop b/examples/jumpmaze/jumpmaze.ujshop
@@ -17,15 +17,15 @@
   )
 
   (:operator (!!visit ?pos)
-    nil
-    nil
+    ()
+    ()
     ((visited ?pos))
   )
 
   (:operator (!!unvisit ?pos)
-    nil
+    ()
     ((visited ?pos))
-    nil
+    ()
   )
 
   (:method (goto)