{"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"self.visit_fn_header(&sig.header);"}]}
                self.visit_fn_header(&sig.header);
            | FnKind::Fn(_, _, Fn { sig, ident, generics, body: None, .. }) => {
                self.visit_ident(ident);