Index: trunk/data/validator/unnecessary.mapcss
===================================================================
--- trunk/data/validator/unnecessary.mapcss	(revision 6628)
+++ trunk/data/validator/unnecessary.mapcss	(revision 6629)
@@ -16,2 +16,7 @@
   assertNoMatch: "way emergency=designated";
 }
+
+/* see ticket #7639 -- Warn when a node has the same tags as its parent way. */
+way >:sameTags node:tagged {
+  throwWarning: tr("Nodes duplicating parent way tags");
+}