Code review comment for lp:~vila/bzr/430749-no-extensions-warning

> I chose to modify the tests that were expecting a clean stderr (or
> some expected stderr) because they were only a few of them.

This makes me a little nervous, in that it adds a new undocumented
rule about what you need to do if you care about stderr when writing a
test (and since pretty much anybody writing a test probably HAS
extensions, they'll never notice it either).