internal static void CheckCancellation <T>(T provider, CancellationToken token)
where T : class
{
#if DEBUG
var c = (ITestableCancellableProvider)provider;
c.CancelCounter++;
if (c.CancelAfter != null)
{
if (c.CancelCounter >= c.CancelAfter)
{
Throw.OperationCanceledException();
}
}
#endif
token.ThrowIfCancellationRequested();
}