:art: clean ast

diff --git a/ast b/ast
index 1b4e5783de6964b23da7e02e79fd4003863437b6..6ffab44c6801d98fc81700927a47471ea607a73d 160000 (submodule)
--- a/ast
+++ b/ast
@@ -1 +1 @@
-Subproject commit 1b4e5783de6964b23da7e02e79fd4003863437b6
+Subproject commit 6ffab44c6801d98fc81700927a47471ea607a73d