public static void Restore()
{
current.ReverseChanges();
int num = current.AssertCount;
current = current.prior;
current.assertCount += num;
}
/// <summary>
/// Restores the last saved context and puts
/// any saved settings back into effect.
/// </summary>
public static void Restore()
{
current.ReverseChanges();
int latestAsserts = current.AssertCount;
current = current.prior;
current.assertCount += latestAsserts;
}