:art: small fixes

diff --git a/ast b/ast
index a6ea1675a1eb1affbf259cba3902f347e2c7d898..81c1475c08c875b30bf95a9ca1e8a1bf597ff389 160000 (submodule)
--- a/ast
+++ b/ast
@@ -1 +1 @@
-Subproject commit a6ea1675a1eb1affbf259cba3902f347e2c7d898
+Subproject commit 81c1475c08c875b30bf95a9ca1e8a1bf597ff389