UnboundedChannel.cs

public override bool TryRead([MaybeNullWhen(false)] out T item)
{
    UnboundedChannel<T> parent = _parent;

    // Dequeue an item if we can
    if (parent._items.TryDequeue(out item))
    {
        CompleteIfDone(parent);
        return true;
    }

    item = default;
    return false;
}