src/ZF/Tools/induct_tacs.ML

     (*associate with each constructor the datatype name and rewrites*)
     val con_pairs = map (fn c => (#1 (dest_Const c), con_info)) constructors
 
   in
     thy
-    |> Sign.add_path (Sign.base_name big_rec_name)
+    |> Sign.add_path (NameSpace.base_name big_rec_name)
     |> PureThy.add_thmss [((Binding.name "simps", simps), [Simplifier.simp_add])] |> snd
     |> DatatypesData.put (Symtab.update (big_rec_name, dt_info) (DatatypesData.get thy))
     |> ConstructorsData.put (fold_rev Symtab.update con_pairs (ConstructorsData.get thy))
     |> Sign.parent_path
   end;