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This is intended for use mostly in test scripts for external tools, which could do without cross-PG-version variations in error message wording. Of course, the SQLSTATE isn't guaranteed stable either, but it should be more so than the error message text. Note: there's a bit of an ABI change for libpq here, but it seems OK because if somebody compiles against a newer version of libpq-fe.h, and then tries to pass PQERRORS_SQLSTATE to PQsetErrorVerbosity() of an older libpq library, it will be accepted and then act like PQERRORS_DEFAULT, thanks to the way the tests in pqBuildErrorMessage3 have historically been phrased. That seems acceptable. Didier Gautheron, reviewed by Dagfinn Ilmari Mannsåker Discussion: https://postgr.es/m/CAJRYxuKyj4zA+JGVrtx8OWAuBfE-_wN4sUMK4H49EuPed=mOBw@mail.gmail.com