diff -r 4562584d9d66 -r b8390cd56b8f src/HOL/Library/Efficient_Nat.thy
--- a/src/HOL/Library/Efficient_Nat.thy	Wed Sep 24 19:39:25 2008 +0200
+++ b/src/HOL/Library/Efficient_Nat.thy	Thu Sep 25 09:28:03 2008 +0200
@@ -400,7 +400,7 @@
   (OCaml "Big'_int.quomod'_big'_int")
   (Haskell "divMod")
 
-code_const "op = \<Colon> nat \<Rightarrow> nat \<Rightarrow> bool"
+code_const "eq_class.eq \<Colon> nat \<Rightarrow> nat \<Rightarrow> bool"
   (SML "!((_ : IntInf.int) = _)")
   (OCaml "Big'_int.eq'_big'_int")
   (Haskell infixl 4 "==")