src/HOL/Tools/Meson/meson.ML

--- a/src/HOL/Tools/Meson/meson.ML	Tue Mar 03 17:20:51 2015 +0100
+++ b/src/HOL/Tools/Meson/meson.ML	Tue Mar 03 19:08:04 2015 +0100
@@ -352,7 +352,7 @@
 in  
   fun freeze_spec th ctxt =
     let
-      val cert = Thm.cterm_of (Proof_Context.theory_of ctxt);
+      val cert = Proof_Context.cterm_of ctxt;
       val ([x], ctxt') = Variable.variant_fixes [name_of (HOLogic.dest_Trueprop (concl_of th))] ctxt;
       val spec' = Thm.instantiate ([], [(spec_var, cert (Free (x, spec_varT)))]) spec;
     in (th RS spec', ctxt') end