The interface to be implemented by drivers that do not run in an own task context, but are chained to other tasks.
Chained version of ReduceCombineDriver.
Chained variant of the GroupReduceCombineDriver Acts like a combiner with a custom output type OUT.
The chained variant of the combine driver which is also implemented in GroupReduceCombineDriver.
A special exception to indicate that an exception occurred in the nested call of a chained stub.
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