diff -r 25cc8f5184e5 -r 776198313227 src/Pure/PIDE/markup.scala
--- a/src/Pure/PIDE/markup.scala	Wed Dec 16 13:17:48 2020 +0100
+++ b/src/Pure/PIDE/markup.scala	Wed Dec 16 13:22:38 2020 +0100
@@ -119,7 +119,7 @@
       def unapply(markup: Markup): Option[Long] =
         if (markup.name == ENTITY) Markup.Ref.unapply(markup.properties) else None
     }
-    object Id
+    object Occ
     {
       def unapply(markup: Markup): Option[Long] =
         Def.unapply(markup) orElse Ref.unapply(markup)