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src/HOL/Tools/record.ML
changeset 33049 c38f02fdf35d
parent 33039 5018f6a76b3f
child 33055 5a733f325939 
--- a/src/HOL/Tools/record.ML	Wed Oct 21 10:15:31 2009 +0200
+++ b/src/HOL/Tools/record.ML	Wed Oct 21 12:09:37 2009 +0200
@@ -1834,7 +1834,7 @@
     val extN = full bname;
     val types = map snd fields;
     val alphas_fields = fold Term.add_tfree_namesT types [];
-    val alphas_ext = inter (op =) (alphas, alphas_fields);
+    val alphas_ext = inter (op =) alphas_fields alphas;
     val len = length fields;
     val variants =
       Name.variant_list (moreN :: rN :: (rN ^ "'") :: wN :: parent_variants)
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