code: func (b *DispatcherBatch) Call() error {
  	return b.CallTimeout(b.c.c.RequestTimeout)
  }
docs: // Call calls all the RPCs added via DispatcherBatch.Add().
  //
  // The order of batched RPCs execution on the server is unspecified.
  // Usually batched RPCs are executed concurrently on the server.
  //
  // The caller may read all BatchResult contents returned
  // from DispatcherBatch.Add() after the Call returns.
  //
  // It is guaranteed that all <-BatchResult.Done channels are unblocked after
  // the Call returns.