dispatch: try and identify third-party extensions as sources of tracebacks Extension authors should explicitly declare their supported hg versions and include a buglink attribute in their extension. In the event that a traceback occurs, we'll identify the least-recently-tested extensionas the most likely source of the defect and suggest the user disable that extension. Packagers should make every effort to ship hg versions from exact tags, or with as few modifications as possible so that the versioning can work appropriately.