Fix build

diff --git a/ast b/ast
index eca382f0b4732c32287751dcec736b16bcac446e..1d6209b5b7f19379d36440f70f9fdd2c90429953 160000 (submodule)
--- a/ast
+++ b/ast
@@ -1 +1 @@
-Subproject commit eca382f0b4732c32287751dcec736b16bcac446e
+Subproject commit 1d6209b5b7f19379d36440f70f9fdd2c90429953