[boost] [testing] How do you interpret the SHA1 revision (outdated results)?

So... I'm looking into Boost.Regex and I'm seeing some failures which appear to refer to outdated sources (line numbers are all wrong for current source), for example: http://www.boost.org/development/tests/develop/developer/output/marshall-mac... But how on earth do I check this? Reported run date is yesterday, but this was fixed/changed on Dec 20th: almost a month ago. And the revision listed on the page is a SHA1 which I can't seem to relate to anything useful? Thanks, John.