--- a/src/HOL/Library/Fset.thy Fri Jul 02 16:20:56 2010 +0200
+++ b/src/HOL/Library/Fset.thy Fri Jul 02 16:50:52 2010 +0200
@@ -18,7 +18,7 @@
lemma Fset_member [simp]:
"Fset (member A) = A"
- by (rule member_inverse)
+ by (fact member_inverse)
declare member_inject [simp]