
diff -r 9ce1a397410a -r 0494964bb226 src/HOL/Data_Structures/RBT_Map.thy
--- a/src/HOL/Data_Structures/RBT_Map.thy	Sat Dec 05 16:13:28 2015 +0100
+++ b/src/HOL/Data_Structures/RBT_Map.thy	Sat Dec 05 16:33:20 2015 +0100
@@ -70,7 +70,7 @@
 proof (standard, goal_cases)
   case 1 show ?case by simp
 next
-  case 2 thus ?case by(simp add: lookup_eq)
+  case 2 thus ?case by(simp add: lookup_map_of)
 next
   case 3 thus ?case by(simp add: inorder_update)
 next




