#13878: Fix failing assertion in linbox/matrix/permutation-matrix.h
------------------------------+---------------------------------------------
   Reporter:  SimonKing       |             Owner:  jason, was              
       Type:  defect          |            Status:  new                     
   Priority:  major           |         Milestone:  sage-5.6                
  Component:  linear algebra  |          Keywords:  debug, linbox, assertion
Work issues:                  |   Report Upstream:  N/A                     
  Reviewers:                  |           Authors:                          
  Merged in:                  |      Dependencies:                          
   Stopgaps:                  |  
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 With the Sage debug version of #13864, one gets the following crash, as
 reported by Nils:
 {{{
 sage: sage.homology.chain_complex.HomologyGroup(100)


 ERROR (at getWritePointer in
 /home/simon/SAGE/debug/sage-5.6.beta1/local/include/linbox/matrix
 /permutation-matrix.h:175):
 Precondition not met:P_.size()
 terminate called after throwing an instance of
 'LinBox::PreconditionFailed'

 Program received signal SIGABRT, Aborted.
 0x00007ffff6d95d95 in raise () from /lib64/libc.so.6
 }}}

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13878>
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