src/HOL/Library/Fset.thy
changeset 39190 a2775776be3f
parent 38857 97775f3e8722
child 39200 bb93713b0925
--- a/src/HOL/Library/Fset.thy	Tue Sep 07 11:51:53 2010 +0200
+++ b/src/HOL/Library/Fset.thy	Tue Sep 07 11:51:53 2010 +0200
@@ -230,7 +230,7 @@
 instantiation fset :: (type) equal
 begin
 
-definition
+definition [code]:
   "HOL.equal A B \<longleftrightarrow> A \<le> B \<and> B \<le> (A :: 'a fset)"
 
 instance proof