prepare for batch processing.

diff --git a/src/prolog/parser b/src/prolog/parser
index f44720afd708c8778e0eeafc0a34121299d0ac86..067301c7f7806a8e83bc8016803bd8f4ab299586 160000 (submodule)
--- a/src/prolog/parser
+++ b/src/prolog/parser
@@ -1 +1 @@
-Subproject commit f44720afd708c8778e0eeafc0a34121299d0ac86
+Subproject commit 067301c7f7806a8e83bc8016803bd8f4ab299586