:art: Update ast

diff --git a/ast b/ast
index 47451b4dde1405956a8635d5f4850beb5ced6402..bb6cb30ffd3fbc8daccff74ba19f90de7b7a6029 160000 (submodule)
--- a/ast
+++ b/ast
@@ -1 +1 @@
-Subproject commit 47451b4dde1405956a8635d5f4850beb5ced6402
+Subproject commit bb6cb30ffd3fbc8daccff74ba19f90de7b7a6029