/// <summary>
/// Creates new <see cref="YacqList"/> object which contains specified values.
/// </summary>
/// <param name="head">The first element of the list.</param>
/// <param name="tail">The list of rest elements of the list.</param>
/// <returns>The <see cref="YacqList"/> object which contains specified values.</returns>
public static YacqList Create(Expression head, YacqList tail)
{
return(head == null && tail == null
? Empty
: new YacqList(head, tail));
}
/// <summary>
/// Initializes a new instance of the <see cref="YacqList"/> class.
/// </summary>
/// <param name="head">The first element of the list.</param>
/// <param name="tail">The list of rest elements of the list.</param>
public YacqList(Expression head, YacqList tail)
{
this._head = head;
this._tail = tail;
}