Examples of errors detected by the V3159 diagnostic

V3159. Modified value of the operand is not used after the increment/decrement operation.

Bitwarden

V3159 Modified value of the 'retriedCount' operand is not used after the postfix increment operation. FreshdeskController.cs 167

private async Task<HttpResponseMessage> CallFreshdeskApiAsync(
  HttpRequestMessage request,
  int retriedCount = 0)
{
  try
  {
    request.Headers.Add("Authorization", _freshdeskAuthkey);
    var response = await _httpClient.SendAsync(request);
    if (   response.StatusCode != System.Net.HttpStatusCode.TooManyRequests
        || retriedCount > 3)
    {
      return response;
    }
  }
  catch
  {
    if (retriedCount > 3)
    {
      throw;
    }
  }
  await Task.Delay(30000 * (retriedCount + 1));
  return await CallFreshdeskApiAsync(request, retriedCount++);    // <=
}

DiIiS

V3159 Modified value of the 'alcount' operand is not used after the postfix increment operation. AchievementManager.cs 360

public static void GrantCriteria(....)
{
  ....
  else
  {
    ....
    uint alcount = alreadycrits.CriteriaId32AndFlags8;

    var newrecord = D3.Achievements
                      ....
                      .SetQuantity32(alcount++) // <=
                      .Build();

    int critCount = UnserializeBytes(achievement.Criteria).Count;
    if (critCount >= 5)
    {
      GrantCriteria(client, 74987246353740);
    }
    client.Account.GameAccount.AchievementCriteria
                              .Remove(alreadycrits);

    client.Account.GameAccount.AchievementCriteria
                              .Add(newrecord);
  }
  ....
}