Bug#1116600: git-debrebase: new-upstream failure

[Ian Jackson]

David Bremner writes ("Bug#1116600: git-debrebase: new-upstream failure"):
> As per the instructions from git-debrease, I'm reporting the failure of
> 
> $ git clone https://salsa.debian.org/emacsen-team/circe
> $ cd circe
> $ git debrebase new-upstream 2.14 upstream/2.14

Thanks.  I have repro'd this.  FTR, HEAD is
  a6c7337ec6786eccf2d386d0bc08e982450fe984

Ian.