:art: Back to Cunion syntax

diff --git a/ast b/ast
index 2c9e91d5b289259b22c78a2b75b34b3c4111dbc6..bb94d2722c601b3a767dbe1149925a3c09b8cca6 160000 (submodule)
--- a/ast
+++ b/ast
@@ -1 +1 @@
-Subproject commit 2c9e91d5b289259b22c78a2b75b34b3c4111dbc6
+Subproject commit bb94d2722c601b3a767dbe1149925a3c09b8cca6