:bug: Don't free C code

diff --git a/ast b/ast
index a65a350359e30f6b8da0af1ba98d282fc9ea1b2f..91ecdc5d50c3cc4bcfa5a404d24115d26092ebcf 160000 (submodule)
--- a/ast
+++ b/ast
@@ -1 +1 @@
-Subproject commit a65a350359e30f6b8da0af1ba98d282fc9ea1b2f
+Subproject commit 91ecdc5d50c3cc4bcfa5a404d24115d26092ebcf