[users at bb.net] Incorrect Docs?

[Chris Spencer]

What's the correct way to refer to a build request's source in a build
priority function?

These docs (http://docs.buildbot.net/current/manual/customization.html)
imply it's simply:

    def getNextRequest(bldr, requests):
        for r in requests:
            print(r.source.branch)

but code like this gives me the error:

    exceptions.AttributeError: 'BuildRequest' object has no attribute
'source'

Is this the correct usage?

I'm using Buildbot 1.4.0, which I believe is the most current release.
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