src/Pure/PIDE/session.scala

   private val change_parser = Consumer_Thread.fork[Text_Edits]("change_parser", daemon = true) {
     case Text_Edits(previous, doc_blobs, text_edits, consolidate, version_result) =>
       val prev = previous.get_finished
       val change =
         Timing.timeit(
-          Thy_Syntax.parse_change(resources, reparse_limit, prev, doc_blobs, text_edits, consolidate),
+          Thy_Syntax.parse_change(session, reparse_limit, prev, doc_blobs, text_edits, consolidate),
           message = _ => "parse_change",
           enabled = timing)
       version_result.fulfill(change.version)
       manager.send(change)
       true