I just today found that the index-only scan feature has broken SSI. I don't think it will take much to fix, and I'm looking at that, but the first thing I wanted was a test to show the breakage. I couldn't find a way to do that without running VACUUM after loading data to the test tables, and because VACUUM refuses to run in a multi-statement batch I propose the following patch to the isolation testing code, which allows multiple setup blocks. Using this code I now have an isolation test to show the breakage.
If there are no objections, I will apply this to HEAD and 9.2.
