On 2011-11-13 08:15, William Stein wrote:
> On Sat, Nov 12, 2011 at 11:10 PM, William Stein <[email protected]> wrote:
>> I'll look into it.
>> On Sat, Nov 12, 2011 at 10:42 PM, Dima Pasechnik <[email protected]> wrote:
>>> It's still 4.7.
> 
> I can't easily upgrade because of the bug that makes upgrading
> completely broken these days (I forget who or what caused this, and
> why we don't fix it...)

Cause: #9433 (merged in sage-4.7.alpha0)
Why we don't fix this: no reason, somebody just has to do it

The "bug" is that if you change any file in the root repository, then
upgrading fails.  Upgrading only works if the installation is 100%
clean.  Unfortunately, most people edit their $SAGE_ROOT/sage making it
unclean.

Shameless plug: see #5852 for making it easier NOT to change
$SAGE_ROOT/sage.

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