[sepia] Reminder: make sure your code builds before submitting a PR

I just examined a PR that was created with code containing an obvious typo that would have caused any kind of compile to fail. Please make sure that you do local builds to validate your code before submitting them for PR. It wastes a large amount of resources to build broken code, and involves much churn between submitters and reviewers, and there's no reason for it. Build it successfully first and then submit it unchanged. Thanks in advance.