{"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"let"}]}
        let nested_impl_item = self.tcx.unwrap().hir_impl_item(impl_item_id);
    fn visit_nested_impl_item(&mut self, impl_item_id: hir::ImplItemId) {
        self.visit_impl_item(nested_impl_item)