{"ast_node_type":"variable","tokens":[{"end":56,"kind":"keyword","start":0,"text":"let"}]}
            let (hir_id, use_ctxt, span) = match field {
                fields.iter().find(|f| self.typeck_results().field_index(f.hir_id) == vf_index);
                Some(field) => (field.hir_id, field.ident.span, field.span),