update

diff --git a/ast b/ast
index 3ef5bb688518c5b537eee6152f1cb81e8f477cdb..310aab6d18d29f3bcb06fa1b5b12f2e7d2e79555 160000 (submodule)
--- a/ast
+++ b/ast
@@ -1 +1 @@
-Subproject commit 3ef5bb688518c5b537eee6152f1cb81e8f477cdb
+Subproject commit 310aab6d18d29f3bcb06fa1b5b12f2e7d2e79555