:art: Remove useless field

diff --git a/ast b/ast
index 54b9c95972359ad1e835c9d1d47243e31e09da8c..e8e5ed5638e9af707d7ee308288b595606d69595 160000 (submodule)
--- a/ast
+++ b/ast
@@ -1 +1 @@
-Subproject commit 54b9c95972359ad1e835c9d1d47243e31e09da8c
+Subproject commit e8e5ed5638e9af707d7ee308288b595606d69595