Fix no_module builds.

src/ast.rs

@@ -717,6 +717,7 @@ impl AST {
     ///
     /// Not available under `no_function`.
     #[cfg(not(feature = "no_function"))]
+    #[allow(dead_code)]
     #[inline]
     pub(crate) fn iter_fn_def(&self) -> impl Iterator<Item = &ScriptFnDef> {
         self.functions