Starting sometime yeserday, it appears that macOS builds of our branches at travis-ci.org are having trouble in an undiagnosable way. All you see on their webpage is a helpful message "An error occurred while generating the build script." and nothing else. https://travis-ci.org/github/git/git/builds/665032524 was the first such failed build of 'pu'. Curiously, a job that was submitted later for an updated 'pu', which was https://travis-ci.org/github/git/git/builds/665061157, did not exhibit the symptom. Anyway, that 1157 build was a one-off and since then macOS builds are failing all branches consistently. For now, I'll write macOS build at travis-ci off as not giving any useful information and move on, but it would be nice to get it corrected, and I am assuming that it is not something we did recently. Just FYI.
