diff -r a816aa3ff391 -r c9e744ea8a38 src/FOLP/ex/If.thy
--- a/src/FOLP/ex/If.thy	Sun Nov 09 14:08:00 2014 +0100
+++ b/src/FOLP/ex/If.thy	Sun Nov 09 17:04:14 2014 +0100
@@ -9,7 +9,7 @@
   assumes "!!x. x : P ==> f(x) : Q"  "!!x. x : ~P ==> g(x) : R"
   shows "?p : if(P,Q,R)"
 apply (unfold if_def)
-apply (tactic {* fast_tac (FOLP_cs addIs @{thms assms}) 1 *})
+apply (tactic {* fast_tac @{context} (FOLP_cs addIs @{thms assms}) 1 *})
 done
 
 schematic_lemma ifE:
@@ -19,7 +19,7 @@
   shows "?p : S"
 apply (insert 1)
 apply (unfold if_def)
-apply (tactic {* fast_tac (FOLP_cs addIs [@{thm 2}, @{thm 3}]) 1 *})
+apply (tactic {* fast_tac @{context} (FOLP_cs addIs [@{thm 2}, @{thm 3}]) 1 *})
 done
 
 schematic_lemma if_commute: "?p : if(P, if(Q,A,B), if(Q,C,D)) <-> if(Q, if(P,A,C), if(P,B,D))"
@@ -33,11 +33,11 @@
 ML {* val if_cs = FOLP_cs addSIs [@{thm ifI}] addSEs [@{thm ifE}] *}
 
 schematic_lemma if_commute: "?p : if(P, if(Q,A,B), if(Q,C,D)) <-> if(Q, if(P,A,C), if(P,B,D))"
-apply (tactic {* fast_tac if_cs 1 *})
+apply (tactic {* fast_tac @{context} if_cs 1 *})
 done
 
 schematic_lemma nested_ifs: "?p : if(if(P,Q,R), A, B) <-> if(P, if(Q,A,B), if(R,A,B))"
-apply (tactic {* fast_tac if_cs 1 *})
+apply (tactic {* fast_tac @{context} if_cs 1 *})
 done
 
 end