prepare for batch processing.

diff --git a/src/prolog/parser b/src/prolog/parser
index c7a23b69559ddefd138bb7c42046ab1b8b2156a6..f2e730cbbabead3c432883c8c2317d76cd426220 160000 (submodule)
--- a/src/prolog/parser
+++ b/src/prolog/parser
@@ -1 +1 @@
-Subproject commit c7a23b69559ddefd138bb7c42046ab1b8b2156a6
+Subproject commit f2e730cbbabead3c432883c8c2317d76cd426220