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484c81bf77
This is useful for developers to find out if an isolation spec is over-engineered or if it needs more work by warning at the end of a test run if a step is not used, generating a failure with extra diffs. While on it, clean up all the specs which include steps not used in any permutations to simplify them. This is a backpatch of 989d23b and 06fdc4e, as it is becoming useful to make all the branches consistent for an upcoming patch that will improve the output generated by isolationtester. Author: Michael Paquier Reviewed-by: Asim Praveen, Melanie Plageman Discussion: https://postgr.es/m/20190819080820.GG18166@paquier.xyz Discussion: https://postgr.es/m/794820.1623872009@sss.pgh.pa.us Backpatch-through: 9.6