diff -r a779f463bae4 -r a2b7a20d6ea3 src/HOL/Complex.thy
--- a/src/HOL/Complex.thy	Mon Jul 12 08:58:27 2010 +0200
+++ b/src/HOL/Complex.thy	Mon Jul 12 10:48:37 2010 +0200
@@ -281,7 +281,7 @@
 definition dist_complex_def:
   "dist x y = cmod (x - y)"
 
-definition open_complex_def [code del]:
+definition open_complex_def:
   "open (S :: complex set) \<longleftrightarrow> (\<forall>x\<in>S. \<exists>e>0. \<forall>y. dist y x < e \<longrightarrow> y \<in> S)"
 
 lemmas cmod_def = complex_norm_def