{"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"err.note(\"to"}]}
            err.note("to `.await` a `Future`, switch to Rust 2018 or later");
            // or results in `ExprKind::Await`. Suggest switching the edition to 2018.
            HelpUseLatestEdition::new().add_to_diag(&mut err);