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src/HOL/Tools/metis_tools.ML
changeset 33037 b22e44496dc2
parent 32994 ccc07fbbfefd
child 33038 8f9594c31de4 
--- a/src/HOL/Tools/metis_tools.ML	Tue Oct 20 13:37:56 2009 +0200
+++ b/src/HOL/Tools/metis_tools.ML	Tue Oct 20 16:13:01 2009 +0200
@@ -631,7 +631,7 @@
         let val (mth, tfree_lits) = hol_thm_to_fol is_conjecture ctxt mode ith
         in
            {axioms = (mth, Meson.make_meta_clause ith) :: axioms,
-            tfrees = tfree_lits union tfrees}
+            tfrees = gen_union (op =) (tfree_lits, tfrees)}
         end;
       val lmap0 = List.foldl (add_thm true)
                         {axioms = [], tfrees = init_tfrees ctxt} cls
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