{"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"errors::AsyncBlockIn2015"}]}
            errors::AsyncBlockIn2015 { span }.add_to_diag(e);
        let async_block_err = |e: &mut Diag<'_>, span: Span| {
            errors::HelpUseLatestEdition::new().add_to_diag(e);