#4987: [with spkg, not ready for review] Upgrade to Cython 0.11
-------------------------+--------------------------------------------------
 Reporter:  robertwb     |       Owner:  mabshoff  
     Type:  enhancement  |      Status:  new       
 Priority:  major        |   Milestone:  sage-3.4.1
Component:  packages     |    Keywords:            
-------------------------+--------------------------------------------------

Comment(by robertwb):

 A lot of refnanny errors in the coercion code:

 {{{
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 | Sage Version 3.2.3, Release Date: 2009-01-05                       |
 | Type notebook() for the GUI, and license() for information.        |
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 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4775, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4775, reference acquired on lines []
 sage/rings/padics/padic_printing.cpp: __init__()
 References leaked:
   Acquired on lines: 4278, 4287, 4345, 4354, 4412, 4421
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4775, reference acquired on lines []
 sage/structure/parent_old.c: _coerce_map_from_()
 NULL argument on line 8032
 Too many decrefs on line 8045, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/structure/parent.c: convert_map_from()
 NULL argument on line 10437
 Too many decrefs on line 10458, reference acquired on lines []
 sage/structure/parent_old.c: has_coerce_map_from_c()
 NULL argument on line 6200
 Too many decrefs on line 6221, reference acquired on lines []
 sage/structure/parent_old.c: _coerce_c()
 NULL argument on line 5157
 Too many decrefs on line 5178, reference acquired on lines []
 sage/structure/parent_old.c: _coerce_c()
 NULL argument on line 5157
 Too many decrefs on line 5178, reference acquired on lines []
 sage/structure/parent_old.c: has_coerce_map_from_c()
 NULL argument on line 6200
 Too many decrefs on line 6221, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4766, reference acquired on lines []
 sage/structure/parent_old.c: coerce_map_from_c()
 NULL argument on line 1361
 Too many decrefs on line 1382, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4766, reference acquired on lines []
 sage/structure/parent_old.c: coerce_map_from_c()
 NULL argument on line 1361
 Too many decrefs on line 1382, reference acquired on lines []
 sage/structure/parent_old.c: _coerce_map_from_()
 NULL argument on line 8032
 Too many decrefs on line 8053, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/structure/parent_old.c: has_coerce_map_from_c()
 NULL argument on line 6200
 Too many decrefs on line 6221, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4775, reference acquired on lines []
 sage/structure/parent_old.c: coerce_map_from_c()
 NULL argument on line 1361
 Too many decrefs on line 1382, reference acquired on lines []
 sage/structure/parent_old.c: _coerce_map_from_()
 NULL argument on line 8032
 Too many decrefs on line 8053, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/structure/element.c: _sub_()
 NULL argument on line 7564
 Too many decrefs on line 7577, reference acquired on lines []
 sage/rings/polynomial/polynomial_element.c: _sub_()
 NULL argument on line 42791
 Too many decrefs on line 42813, reference acquired on lines []
 sage/structure/factory.c: get_version()
 NULL argument on line 1596
 Too many decrefs on line 1617, reference acquired on lines []
 sage/structure/factory.c: other_keys()
 NULL argument on line 1924
 Too many decrefs on line 1948, reference acquired on lines []
 sage/structure/factory.c: get_object()
 NULL argument on line 819
 Too many decrefs on line 846, reference acquired on lines []
 sage/structure/factory.c: get_version()
 NULL argument on line 1596
 Too many decrefs on line 1617, reference acquired on lines []
 sage/structure/factory.c: get_object()
 NULL argument on line 819
 Too many decrefs on line 846, reference acquired on lines []
 sage/structure/factory.c: get_version()
 NULL argument on line 1596
 Too many decrefs on line 1617, reference acquired on lines []
 sage/structure/factory.c: other_keys()
 NULL argument on line 1924
 Too many decrefs on line 1940, reference acquired on lines []
 sage/structure/factory.c: get_object()
 NULL argument on line 819
 Too many decrefs on line 846, reference acquired on lines []
 References leaked:
   Acquired on lines: 1048, 1114
   Acquired on lines: 1049, 1115
   Acquired on lines: 1050, 1116
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent_old.c: _an_element_()
 NULL argument on line 8393
 Too many decrefs on line 8400, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent_old.c: _coerce_c()
 NULL argument on line 5157
 Too many decrefs on line 5178, reference acquired on lines []
 sage/structure/parent_old.c: has_coerce_map_from_c()
 NULL argument on line 6200
 Too many decrefs on line 6221, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4775, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4766, reference acquired on lines []
 sage/structure/parent_old.c: coerce_map_from_c()
 NULL argument on line 1361
 Too many decrefs on line 1382, reference acquired on lines []
 sage/structure/parent_old.c: _coerce_map_from_()
 NULL argument on line 8032
 Too many decrefs on line 8053, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4775, reference acquired on lines []
 sage/structure/parent_old.c: _coerce_map_from_()
 NULL argument on line 8032
 Too many decrefs on line 8045, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4775, reference acquired on lines []
 sage/structure/parent.c: _convert_map_from_()
 NULL argument on line 11296
 Too many decrefs on line 11317, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4775, reference acquired on lines []
 sage/structure/parent_old.c: _generic_convert_map()
 NULL argument on line 8540
 Too many decrefs on line 8561, reference acquired on lines []
 sage/structure/parent.c: convert_map_from()
 NULL argument on line 10437
 Too many decrefs on line 10458, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4775, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4775, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4766, reference acquired on lines []
 sage/structure/parent_old.c: _coerce_map_from_()
 NULL argument on line 8032
 Too many decrefs on line 8045, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/structure/parent.c: convert_map_from()
 NULL argument on line 10437
 Too many decrefs on line 10458, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4775, reference acquired on lines []
 sage/structure/parent_old.c: _coerce_map_from_()
 NULL argument on line 8032
 Too many decrefs on line 8045, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/structure/parent.c: has_coerce_map_from()
 NULL argument on line 8562
 Too many decrefs on line 8585, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent_old.c: _coerce_map_from_()
 NULL argument on line 8032
 Too many decrefs on line 8045, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/structure/parent_old.c: _coerce_map_from_()
 NULL argument on line 8032
 Too many decrefs on line 8045, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/structure/parent.c: convert_map_from()
 NULL argument on line 10437
 Too many decrefs on line 10458, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4775, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4775, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent_old.c: _coerce_map_from_()
 NULL argument on line 8032
 Too many decrefs on line 8045, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4775, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4775, reference acquired on lines []
 sage/structure/parent_old.c: _coerce_map_from_()
 NULL argument on line 8032
 Too many decrefs on line 8045, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/structure/parent.c: convert_map_from()
 NULL argument on line 10437
 Too many decrefs on line 10458, reference acquired on lines []
 sage/structure/parent_old.c: _an_element_c()
 NULL argument on line 7421
 Too many decrefs on line 7434, reference acquired on lines []
 sage/structure/parent_old.c: _an_element_()
 NULL argument on line 8393
 Too many decrefs on line 8406, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/rings/polynomial/polynomial_element.c: _mul_()
 NULL argument on line 10869
 Too many decrefs on line 10882, reference acquired on lines []
 sage/rings/polynomial/polynomial_element.c: _lmul_()
 NULL argument on line 5211
 Too many decrefs on line 5233, reference acquired on lines []
 sage/structure/parent_old.c: get_action_c()
 NULL argument on line 2800
 Too many decrefs on line 2831, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/rings/polynomial/polynomial_element.c: _mul_()
 NULL argument on line 10869
 Too many decrefs on line 10882, reference acquired on lines []
 sage/rings/polynomial/polynomial_element.c: _lmul_()
 NULL argument on line 5211
 Too many decrefs on line 5233, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/rings/polynomial/polynomial_element.c: _mul_()
 NULL argument on line 10869
 Too many decrefs on line 10882, reference acquired on lines []
 sage/rings/polynomial/polynomial_element.c: _lmul_()
 NULL argument on line 5211
 Too many decrefs on line 5233, reference acquired on lines []
 sage/structure/parent_old.c: get_action_c()
 NULL argument on line 2800
 Too many decrefs on line 2831, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent_old.c: get_action_c()
 NULL argument on line 2800
 Too many decrefs on line 2831, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/structure/element.c: _add_()
 NULL argument on line 7103
 Too many decrefs on line 7116, reference acquired on lines []
 sage/rings/polynomial/polynomial_element.c: _add_()
 NULL argument on line 42088
 Too many decrefs on line 42110, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/structure/parent.c: has_coerce_map_from()
 NULL argument on line 8562
 Too many decrefs on line 8585, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4775, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent_old.c: _coerce_map_from_()
 NULL argument on line 8032
 Too many decrefs on line 8045, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4775, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent_old.c: _an_element_()
 NULL argument on line 8393
 Too many decrefs on line 8406, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/structure/parent_old.c: _coerce_map_from_()
 NULL argument on line 8032
 Too many decrefs on line 8045, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4775, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4775, reference acquired on lines []
 sage/structure/parent_old.c: _coerce_map_from_()
 NULL argument on line 8032
 Too many decrefs on line 8045, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/structure/parent_old.c: _an_element_c()
 NULL argument on line 7421
 Too many decrefs on line 7434, reference acquired on lines []
 sage/structure/parent_old.c: _an_element_()
 NULL argument on line 8393
 Too many decrefs on line 8406, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4775, reference acquired on lines []
 sage/structure/parent_old.c: get_action_c()
 NULL argument on line 2800
 Too many decrefs on line 2831, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent_old.c: _coerce_map_from_()
 NULL argument on line 8032
 Too many decrefs on line 8045, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/structure/parent.c: an_element()
 NULL argument on line 13813
 Too many decrefs on line 13826, reference acquired on lines []
 sage/structure/parent_old.c: _coerce_c()
 NULL argument on line 5157
 Too many decrefs on line 5178, reference acquired on lines []
 sage/structure/parent_old.c: has_coerce_map_from_c()
 NULL argument on line 6200
 Too many decrefs on line 6221, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4775, reference acquired on lines []
 sage/rings/ring.c: is_exact()
 NULL argument on line 4760
 Too many decrefs on line 4766, reference acquired on lines []
 sage/structure/parent_old.c: coerce_map_from_c()
 NULL argument on line 1361
 Too many decrefs on line 1382, reference acquired on lines []
 sage/structure/parent_old.c: _coerce_map_from_()
 NULL argument on line 8032
 Too many decrefs on line 8053, reference acquired on lines []
 sage/structure/parent.c: coerce_map_from()
 NULL argument on line 8916
 Too many decrefs on line 8937, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 sage/structure/parent_old.c: get_action_c()
 NULL argument on line 2800
 Too many decrefs on line 2831, reference acquired on lines []
 sage/structure/parent_old.c: _get_action_()
 NULL argument on line 8182
 Too many decrefs on line 8213, reference acquired on lines []
 sage/structure/parent.c: get_action()
 NULL argument on line 11428
 Too many decrefs on line 11459, reference acquired on lines []
 }}}

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4987#comment:8>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of 
Reinventing the Wheel

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