Hi Reini, hi all, Reini, I'm sending this to you specifically because you're the biggest user of B.pm. Comments from others on the list are as welcome, though. Currently, the tests in ext/B/t/* have a number of cases that check for perl versions to attempt to be portable across perl versions. Does this even make sense? There's a reason why B is in ext/. It's very much NOT independent of the perl it runs against. For the list/pushmark optimization, I'm faced with having to add big blocks of almost copy/pasted Concise output to make the tests pass OR I have to do something "clever". And not clever in the good way. So if I could instead just make B tests always work against the current version of perl, I'd be a much happier camper. What do you think? Best regards, SteffenThread Next