:art: Flag factory

diff --git a/ast b/ast
index 209581d7d804fab314f54ee35cf68210aabc0674..31bfb80acafe4235a0446cde7c93b0e3687d503c 160000 (submodule)
--- a/ast
+++ b/ast
@@ -1 +1 @@
-Subproject commit 209581d7d804fab314f54ee35cf68210aabc0674
+Subproject commit 31bfb80acafe4235a0446cde7c93b0e3687d503c