if (pool.depositFeeBP > 0) {
  uint depositFee = _amount.mul(pool.depositFeeBP).div(_perMille);
  user.amount = SafeCast.toUint128(user.amount + _amount - depositFee);
}
if (pool.depositFeeBP > 0) {
  uint depositFee = _amount.mul(pool.depositFeeBP).div(_perMille);
  user.amount = SafeCast.toUint128(user.amount + _amount - depositFee);
  UserInfo storage feeRecipient = userInfo[_pid][feeRecipient];
  // TODO: update and send feeRecipient pending concur rewards
  feeRecipient.amount = SafeCast.toUint128(feeRecipient.amount + depositFee);
  // TODO: update fee recipient's rewardDebt
}
