Index: trunk/data/validator/deprecated.mapcss
===================================================================
--- trunk/data/validator/deprecated.mapcss	(revision 15715)
+++ trunk/data/validator/deprecated.mapcss	(revision 15722)
@@ -1887,2 +1887,7 @@
   group: tr("deprecated tagging");
 }
+
+node[segregated][segregated!=yes][segregated!=no],
+way[segregated ][segregated!=yes][segregated!=no] {
+  throwWarning: tr("unusual value of {0}", "{0.key}");
+}