If you are working from an old base commit, either rebase your patch before submitting to Phabricator (painful? you will have to do it before pushing anyway, might as well do it now), or ignore the Harbormaster validate result. I am typically working on some non-trivial features (ie. rebases tend to be painful). Having Harbormaster build results is a useful way of telling whether I broke something or not. Even if it is for some older commit. Rebases take time and if I know my feature will not be finished in the next couple of weeks I want to save myself from unnecessary rebasing. Why rebase all the time if I can do it just once at the end?
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