/// <summary>
/// Throws an <see cref="System.InvalidOperationException"/> if the given argument value
/// does not exist in the collection provided.
/// </summary>
/// <typeparam name="T">The type of the argument.</typeparam>
/// <param name="argValue">The argument value.</param>
/// <param name="disallowed">The collection of allowed values.</param>
/// <param name="argName">The argument name.</param>
public static void In <T>(T argValue, IEnumerable <T> allowed, string argName)
{
Insist.In(argValue, allowed, argName, null);
}
