The commit 00199fb220aa173d8585b9e90654dafd3247d82d is the Sage-6.3 release 
commit. In other words, there is nothing in that branch. 

$ git remote update
$ git log -1 
trac/u/elarson3/isogeny_bounds_for_elliptic_curves_over_number_fields 
commit 00199fb220aa173d8585b9e90654dafd3247d82d
Author: Volker Braun <vbraun.n...@gmail.com>
Date:   Sun Aug 10 12:29:38 2014 +0100

    Updated Sage version to 6.3

$ git merge 
trac/u/elarson3/isogeny_bounds_for_elliptic_curves_over_number_fields
Already up-to-date.

Not sure where the error in your git merge command comes from. Which git 
version do you use?



On Wednesday, August 13, 2014 9:34:40 AM UTC+1, John Cremona wrote:
>
> Can anyone see what is wrong with the branch & commit showing at 
> http://trac.sagemath.org/ticket/16806 ?  The branch name is not a 
> link.  In my own clone after doing a "git remote update" I can see the 
> branch: 
>
> ec@atkin:~/sage (branch: isogs-ecnf)$ git br -r | grep larson 
>   trac/u/elarson3/isogeny_bounds_for_elliptic_curves_over_number_fields 
>
> but when I try 
>
> git merge 
> trac/u/elarson3/isogeny_bounds_for_elliptic_curves_over_number_fields 
>
> to merge it into my own workin gbranch I get the error message 
>
> fatal: 
> 'trac/u/elarsen3/isogeny_bounds_for_elliptic_curves_over_number_fields' 
> does not point to a commit 
>
> The author of the branch, Eric Larson, has not used git + sage + trac 
> before, and has sent me a copy of the one file changed in his branch, 
> so I could make a new branch myself, but it would be more helpful to 
> him if someone was able to dignose what went wrong. 
>
> John 
>

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