diff -r 1aa2e40df9ff -r 837211662fb8 src/CCL/Term.thy
--- a/src/CCL/Term.thy	Thu May 16 15:21:12 2013 +0200
+++ b/src/CCL/Term.thy	Thu May 16 17:39:38 2013 +0200
@@ -204,7 +204,7 @@
 method_setup beta_rl = {*
   Scan.succeed (fn ctxt =>
     SIMPLE_METHOD' (CHANGED o
-      simp_tac (ctxt addsimps @{thms rawBs} setloop (stac @{thm letrecB}))))
+      simp_tac (ctxt addsimps @{thms rawBs} setloop (fn _ => stac @{thm letrecB}))))
 *}
 
 lemma ifBtrue: "if true then t else u = t"