Comment 1 for bug 124980

This is crucial in cases like this: the local user has a checkout of the remote, then the remote changes its repo format, leaving the user with a cryptic error the next time a pull is attempted. I was bitten by this when the repo for Bazaar itself changed its format. As I write this, I'm still in the middle of a trial-and-error process trying to figure out the right way to upgrade my local repo.