Code Challenge: Make the assertion fire
time to read 2 min | 256 words

Can you create a calling code that would make this code fire the assertion?

public static IEnumerable<int> Fibonnaci(CancellationToken token)
{
    yield return 0;
    yield return 1;

    var prev = 0;
    var cur = 1;

    try
    {
        while (token.IsCancellationRequested == false)
        {
            var tmp = prev + cur;
            prev = cur;
            cur = tmp;
            yield return tmp;
        }
    }
    finally
    {
        Debug.Assert(token.IsCancellationRequested);
    }
}

Note that cancellation token cannot be changed, once cancelled, it can never revert.

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