{"ast_node_type":"variable","tokens":[{"end":43,"kind":"keyword","start":0,"text":"let"}]}
        let (suggestion, applicability) = (
        let sugg_span = span.unwrap_or(call_expr.span).shrink_to_hi();
            format!("({})", (0..params).map(|_| "_").collect::<Vec<_>>().join(", ")),