#12540: Graph library passes almost surelly erroneous calls without an exception
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   Reporter:  brunellus     |          Owner:  jason, ncohen, rlm
       Type:  defect        |         Status:  new               
   Priority:  major         |      Milestone:  sage-5.0          
  Component:  graph theory  |       Keywords:                    
Work_issues:                |       Upstream:  N/A               
   Reviewer:                |         Author:                    
     Merged:                |   Dependencies:                    
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 1. Dense backend doesn't support edge labels, but add_edge(1, 2, 3) passes
 and behaves like add_edge(1, 2, None). (#12387)
  2. Adding a loop to a graph with allows_loops=False do nothing.
  3. Adding an already present edge to a graph with allows_multiedges=False
 do nothing.
  4. (Other?)

 Is this the proper behavior?

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12540>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
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