src/Pure/Isar/local_defs.ML

   fun merge _ = Thm.merge_thms;
 );
 
 fun print_rules ctxt =
   Pretty.writeln (Pretty.big_list "definitional transformations:"
-    (map (ProofContext.pretty_thm ctxt) (Rules.get (Context.Proof ctxt))));
+    (map (Display.pretty_thm ctxt) (Rules.get (Context.Proof ctxt))));
 
 val defn_add = Thm.declaration_attribute (Rules.map o Thm.add_thm);
 val defn_del = Thm.declaration_attribute (Rules.map o Thm.del_thm);