#12876: Fix element and parent classes of Hom categories to be abstract, and
simplify the Hom logic.
--------------------------------------------------------+-------------------
       Reporter:  nthiery                               |         Owner:  
nthiery                       
           Type:  enhancement                           |        Status:  
needs_review                  
       Priority:  major                                 |     Milestone:  
sage-5.1                      
      Component:  categories                            |    Resolution:        
                        
       Keywords:  categories, Hom                       |   Work issues:  Fix 
ring_refcount_dict problem
Report Upstream:  N/A                                   |     Reviewers:  Simon 
King                    
        Authors:  Nicolas M. ThiƩry                     |     Merged in:        
                        
   Dependencies:  #715, #11521, #12875, #12877, #12215  |      Stopgaps:        
                        
--------------------------------------------------------+-------------------

Comment (by nthiery):

 Replying to [comment:21 SimonKing]:
 > Yes! Adding #12215 fixes the segfault. I am now running doctests. Do you
 mind adding it as another dependency, provided that the test suite passes?

 That's ok for me. Thanks for tracking all of those down! I'll try to
 review #12215, but that probably won't be before Monday.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12876#comment:26>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
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