fix rust borrow

tools/src/main.rs

@@ -52,7 +52,7 @@ fn main() {
     let mut decls = Vec::new();
 
     // Process declarations
-    for item in syntax.items {
+    for item in &syntax.items {
         match item {
             Item::Fn(item_fn) => {
                 if let Some(decl) = parse_function(&item_fn) {