Re: [BUG] Incosistent repository state when trying to rename HEAD in the middle of a rebase

Kaartic Sivaraam [off-list ref] writes:

I was able to spare some time to dig into this and found a few things.

First, it seems that the issue is more generic and the BUG kicks in
whenever HEAD is not a symbolic ref.

Interesting.  

Shortly we'll be rewinding the tip of 'next', and it is a good
opportunity to kick any not-so-well-cooked topic back to 'pu',
so let's figure out what is going on after that happens (at which
point let's eject the "branch name sanity" topic out of 'next').