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Writing "pg_regress --dbname= ..." led to a crash, because we weren't expecting there to be no database name supplied. It doesn't seem like a great idea to run regression tests in whatever is the user's default database; so rather than supporting this case let's explicitly reject it. Per report from Xing Guo. Back-patch to all supported branches. Discussion: https://postgr.es/m/CACpMh+A8cRvtvtOWVAZsCM1DU81GK4DL26R83y6ugZ1osV=ifA@mail.gmail.com