#12313: Fix yet another memory leak caused by caching of coercion data
-------------------------------------------------+--------------------------
       Reporter:  SimonKing                      |         Owner:  rlm         
           Type:  defect                         |        Status:  needs_review
       Priority:  major                          |     Milestone:  sage-5.0    
      Component:  memleak                        |    Resolution:              
       Keywords:  coercion weak dictionary       |   Work issues:              
Report Upstream:  N/A                            |     Reviewers:              
        Authors:  Simon King, Jean-Pierre Flori  |     Merged in:              
   Dependencies:  #715, #11599                   |      Stopgaps:              
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Comment (by defeo):

 I think the problem is independent from these tickets.

 I added these two lines in a clean sage 4.7.2 tree:

 {{{
 --- a/sage/structure/coerce_dict.pyx
 +++ b/sage/structure/coerce_dict.pyx
 @@ -35,7 +35,9 @@
 -
 +
 +        sage: list(sorted([('a', 1), (-15,3), ('ab', 2)]))
 +        [(-15, 3), ('a', 1), ('ab', 2)]
 }}}

 and run a `make ptest`. It failed with error:

 {{{
 File "/home/defeo/sage-4.7.2/devel/sage-
 main/sage/structure/coerce_dict.pyx", li
 ne 39:
     sage: list(sorted([('a', 1), (-15,3), ('ab', 2)]))
 Expected:
     [(-15, 3), ('a', 1), ('ab', 2)]
 Got:
     [('a', 1), ('ab', 2), (-15, 3)]
 }}}

 I think some doctest hidden in some file tested before `coerce_dict.pyx`
 may be redefining `sorted`. If this bug is confirmed in newer releases, we
 should make a separate ticket.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12313#comment:43>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
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