{"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"unused.iter().map(|&(span,"}]}
            unused.iter().map(|&(span, named)| errors::FormatUnusedArg { span, named }).collect();
        let unused_labels =
        let unused_spans = unused.iter().map(|&(span, _)| span).collect();