diff --git a/src/protocol/mod.rs b/src/protocol/mod.rs
index 45f880fbe64dec700ef72086e324877299969e5b..aede2abfb294d59af690ffa77fc76666f3e58184 100644
--- a/src/protocol/mod.rs
+++ b/src/protocol/mod.rs
@@ -53,7 +53,8 @@ impl ProtocolDescription {
         let source = InputSource::new(String::new(), Vec::from(buffer));
         let mut parser = Parser::new();
         parser.feed(source).expect("failed to feed source");
-        
+
+        parser.write_ast_to = Some(String::from("hello.txt"));
         if let Err(err) = parser.parse() {
             println!("ERROR:\n{}", err);
             return Err(format!("{}", err))