in reply to Roll Call - How new is your Perl?
At work, we are using 5.10.1, so fortunately, say, state and //= exist. At home (i.e. for fun and contract side jobs) I use 5.14.2. I also happen to have the blead perl checked out somewhere to check for a bug before I send a bug report.
I have been bitten once by the difference: at home, I forgot to dereference an arrayref in push, which worked ok in 5.14, but crashed in 5.10. So far so good.