{"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"span_err(path_span,"}]}
                    span_err(path_span, "invalid nested attribute")
                (_, SubdiagnosticKind::MultipartSuggestion { .. }) => {
                        .help("only `no_span`, `style` and `applicability` are valid nested attributes")