{"ast_node_type":"variable","tokens":[{"end":88,"kind":"keyword","start":0,"text":"let"}]}
            let suggestion_span = header_span.shrink_to_hi().to(sig.decl.output.span());
            let header_span = sig.header.span().unwrap_or(sig.span.shrink_to_lo());
            let padding = if header_span.is_empty() { "" } else { " " };