fixed failed to free let node

1 files changed, 5 insertions, 0 deletions

diff --git a/src/ast.c b/src/ast.c
index 83a55c6..66e76ea 100644
--- a/src/ast.c
+++ b/src/ast.c
@@ -139,6 +139,11 @@ void ast_free(ASTNode *node) {
     case NT_NOT:
       ast_free(node->u.d_not.bexp);
       break;
+    case NT_LET:
+      ast_free(node->u.d_let.var);
+      ast_free(node->u.d_let.aexp);
+      ast_free(node->u.d_let.stm);
+      break;
   }
   free(node);
 }
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