I see a message somewhat like this.
Harbormaster failed to build the active diff for this revision. Build failures: FAILED Build 52326: arc lint + arc unit You can review build details here: Harbormaster URI: https://tails.corp.dropbox.com/B52279 Land revision anyway, despite build failures? [y/N] y
From this message, I can't tell if it's a lint failure or unit failure without clicking through. This becomes a hinderance when the internal policy for lint and unit differ.
T8856 appears to help with the issue if it were expanded to show both lint and unit errors, but I would prefer not to combine lint/unit into one monolith in the results since they do fundamentally different operations.