{"ast_node_type":"variable","tokens":[{"end":94,"kind":"keyword","start":0,"text":"let"}]}
            let rest_span = callee_expr_span.shrink_to_hi().to(call_expr.span.shrink_to_hi());
            let up_to_rcvr_span = segment.ident.span.until(callee_expr_span);
            let rest_snippet = if let Some(first) = rest.first() {