Index: /trunk/resources/data/validator/combinations.mapcss
===================================================================
--- /trunk/resources/data/validator/combinations.mapcss	(revision 18449)
+++ /trunk/resources/data/validator/combinations.mapcss	(revision 18450)
@@ -543,4 +543,6 @@
   throwWarning: tr("alternative name without {0}", "{1.key}");
   group: tr("missing tag");
+  assertMatch:   "way alt_name=Foo";
+  assertNoMatch: "way alt_name=Foo name=Bar";
 }