code: func (txc txStateChanges) setState(txHash common.Hash, mined bool) {
  	val, ent := txc[txHash]
  	if ent && (val != mined) {
  		delete(txc, txHash)
  	} else {
  		txc[txHash] = mined
  	}
  }
docs: // setState sets the status of a tx to either recently mined or recently rolled back