diff -r 85ee44388f7b -r f71978e47cd5 src/HOL/Quotient_Examples/FSet.thy
--- a/src/HOL/Quotient_Examples/FSet.thy	Mon Apr 26 13:43:31 2010 +0200
+++ b/src/HOL/Quotient_Examples/FSet.thy	Mon Apr 26 15:14:14 2010 +0200
@@ -387,7 +387,7 @@
   apply (simp add: memb_def[symmetric] memb_finter_raw)
   by (auto simp add: memb_def)
 
-instantiation fset :: (type) "{bot,distrib_lattice}"
+instantiation fset :: (type) "{bounded_lattice_bot,distrib_lattice}"
 begin
 
 quotient_definition
@@ -922,14 +922,13 @@
 
 text {* funion *}
 
-lemma funion_simps[simp]:
-  shows "{||} |\<union>| S = S"
-  and   "finsert x S |\<union>| T = finsert x (S |\<union>| T)"
-  by (lifting append.simps)
+lemmas [simp] =
+  sup_bot_left[where 'a="'a fset"]
+  sup_bot_right[where 'a="'a fset"]
 
-lemma funion_empty[simp]:
-  shows "S |\<union>| {||} = S"
-  by (lifting append_Nil2)
+lemma funion_finsert[simp]:
+  shows "finsert x S |\<union>| T = finsert x (S |\<union>| T)"
+  by (lifting append.simps(2))
 
 lemma singleton_union_left:
   "{|a|} |\<union>| S = finsert a S"