Exception already being thrown

So the Parallel class looks at the CancellationToken [from time to time, that's not specified] to prematurely end the loop. But what happens if the OperationCanceledException was already thrown from within the code executed in parallel, using the same CancellationToken? Will it be caught and handled properly? Or will it be passed on in some form of AggregateException just like any other exception being thrown in Parallel loops? Multiple concurrently running "tasks" might throw that exception at the same time before the loop can end. Some clarification on how I may use the CancellationToken would be helpful.

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* ID: 7620a94b-fde4-4d61-904d-3ff319427c38
* Version Independent ID: c8805d8a-332c-ad1a-1e8d-dd10daf1b59e
* Content: [ParallelOptions.CancellationToken Property (System.Threading.Tasks)](https://docs.microsoft.com/en-us/dotnet/api/system.threading.tasks.paralleloptions.cancellationtoken?f1url=https%3A%2F%2Fmsdn.microsoft.com%2Fquery%2Fdev15.query%3FappId%3DDev15IDEF1%26l%3DEN-US%26k%3Dk(System.Threading.Tasks.ParallelOptions.CancellationToken);k(DevLang-csharp)%26rd%3Dtrue%26f%3D255%26MSPPError%3D-2147217396&view=netframework-4.7.2)
* Content Source: [xml/System.Threading.Tasks/ParallelOptions.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System.Threading.Tasks/ParallelOptions.xml)
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