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src/HOL/Set.thy
changeset 25965 05df64f786a4
parent 25762 c03e9d04b3e4
child 26150 f6bd8686b71e 
--- a/src/HOL/Set.thy	Fri Jan 25 14:53:58 2008 +0100
+++ b/src/HOL/Set.thy	Fri Jan 25 14:54:41 2008 +0100
@@ -2141,7 +2141,7 @@
 definition
   is_empty :: "'a set \<Rightarrow> bool"
 where
-  [code func del]: "is_empty A \<longleftrightarrow> A = {}"
+  [code func del, code post]: "is_empty A \<longleftrightarrow> A = {}"
 lemmas [code inline] = is_empty_def [symmetric]
 
 lemma is_empty_insert [code func]:
isabelle