#17156: Creating a graph from a immutable digraph raises an error
-----------------------------------+----------------------------
       Reporter:  tscrim           |        Owner:  tscrim
           Type:  defect           |       Status:  needs_review
       Priority:  major            |    Milestone:  sage-6.4
      Component:  graph theory     |   Resolution:
       Keywords:  immutable graph  |    Merged in:
        Authors:  Nathann Cohen    |    Reviewers:
Report Upstream:  N/A              |  Work issues:
         Branch:  u/ncohen/17156   |       Commit:
   Dependencies:                   |     Stopgaps:
-----------------------------------+----------------------------
Changes (by {'newvalue': u'Nathann Cohen', 'oldvalue': ''}):

 * status:  new => needs_review
 * branch:   => u/ncohen/17156
 * author:   => Nathann Cohen


Comment:

 Here it is. Besides, for some reason the 'sparse' keyword was deprecated
 in `DiGraph.to_undirected` but not in `Graph.to_directed`, to be replaced
 by 'data_structure'. As the !Graph/!DiGraph constructors both have the two
 arguments, I chose to "solve that" by removing the deprecation in
 !DiGraph. That is the second commit.

 Nathann

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Ticket URL: <http://trac.sagemath.org/ticket/17156#comment:2>
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