CarrierInterface additional requirement

[joshpennington]

When creating a shipping module, your class should implement \Magento\Shipping\Model\Carrier\CarrierInterface

However, in order for your shipping module to actually be used, you have to implement a method called proccessAdditionalValidation that is not required by the CarrierInterface

Failure to implement this method causes your module to be ignored in /app/code/Magento/Shipping/Model/Shipping.php because on line 250, $result will equal false because that method is not called because it does not exist in your module.

[sivaschenko]

@joshpennington Thank you for report. Internal ticket MAGETWO-42591 created to track this issue

[magento-engcom-team]

@joshpennington, thank you for your report.
We've created internal ticket(s) MAGETWO-42591 to track progress on the issue.