public virtual QKeyValue VisitQKeyValue(QKeyValue node) {
Contract.Requires(node != null);
Contract.Ensures(Contract.Result<QKeyValue>() != null);
var newParams = new List<object>();
for (int i = 0, n = node.Params.Count; i < n; i++) {
var e = node.Params[i] as Expr;
newParams.Add(e != null ? this.Visit(e) : node.Params[i]);
}
node.ClearParams();
node.AddParams(newParams);
if (node.Next != null) {
node.Next = (QKeyValue)this.Visit(node.Next);
}
return node;
}