{{"unexpected error", _TestSupport's makeCaughtErrorRecord(eText, eNumber, eFrom, eTo, ePartial)}}) -- TO DO: without stack trace support, there's no way to distinguish an error raised by the code being tested versus an error caused by a bug in the test code, so we can only say error was 'unexpected' and leave user to figure out why; allowing `call_NAME` handlers to be used by `assert test result` would give users the opportunity to box up the code being tested allowing TestTools to distinguish the cause