{"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"HelpUseLatestEdition::new().add_to_diag(&mut"}]}
            HelpUseLatestEdition::new().add_to_diag(&mut err);
            err.note("to `.await` a `Future`, switch to Rust 2018 or later");
        }