{"ast_node_type":"variable","tokens":[{"end":49,"kind":"keyword","start":0,"text":"if"}]}
        if let Some(_header) = fn_kind.header() {
    fn visit_fn(&mut self, fn_kind: FnKind<'a>, span: Span, _: NodeId) {
            // Stability of const fn methods are covered in `visit_assoc_item` below.