src/ZF/Tools/primrec_package.ML

 
     val rewrites = def_thm :: map mk_meta_eq (#rec_rewrites con_info)
     val eqn_thms =
       eqn_terms |> map (fn t =>
         Goal.prove_global thy1 [] [] (Ind_Syntax.traceIt "next primrec equation = " thy1 t)
-          (fn _ => EVERY [rewrite_goals_tac rewrites, rtac refl 1]));
+          (fn _ => EVERY [rewrite_goals_tac rewrites, rtac @{thm refl} 1]));
 
     val (eqn_thms', thy2) =
       thy1
       |> PureThy.add_thms ((eqn_names ~~ eqn_thms) ~~ eqn_atts);
     val (_, thy3) =