{"ast_node_type":"variable","tokens":[{"end":53,"kind":"keyword","start":0,"text":"let"}]}
                    let lhs_rslt = has_let_expr(lhs);
                ExprKind::Binary(BinOp { node: BinOpKind::And, .. }, lhs, rhs) => {
                    let rhs_rslt = has_let_expr(rhs);