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        This section uses the names Alloc1, Alloc2, alloc1,
        alloc2, Args, CompletionHandler,
        completion_handler, Executor1, Executor2,
        ex1, ex2, f, i,
        N, Signature, token,
        T[sub i], t[sub i],
        work1, and work2 as placeholders for specifying
        the requirements below.