update to lexer error handling.

diff --git a/src/prolog/parser b/src/prolog/parser
index 914f216add609f7edde947e6684325dd6d5a7c4c..0e9dd3a01f21c6457bd1bcb35518ccdb502c82bd 160000 (submodule)
--- a/src/prolog/parser
+++ b/src/prolog/parser
@@ -1 +1 @@
-Subproject commit 914f216add609f7edde947e6684325dd6d5a7c4c
+Subproject commit 0e9dd3a01f21c6457bd1bcb35518ccdb502c82bd