:art: Update ast

diff --git a/ast b/ast
index 47a560cb57d718fd35e936880981360c09b38a58..51f054f7529e39e78a41eb0f68baedfb26a1ad07 160000 (submodule)
--- a/ast
+++ b/ast
@@ -1 +1 @@
-Subproject commit 47a560cb57d718fd35e936880981360c09b38a58
+Subproject commit 51f054f7529e39e78a41eb0f68baedfb26a1ad07