[using v2.1.3]
When using "rebase -i" and the working dir contains untracked files that are present in the new base, we correctly get a "would be overwritten by checkout" error, but then the whole rebase interrupts the (long) listing of the incriminated files in the middle of a line and terminates with:
Aborting could not detach HEAD
And consequently we are not rebasing any more, and the precious instruction sheet has been lost.