#8743: change_ring on a rational matrix may return self
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 Reporter:  jason              |         Owner:  jason, was 
     Type:  defect             |        Status:  closed     
 Priority:  major              |     Milestone:  sage-4.4.4 
Component:  linear algebra     |    Resolution:  fixed      
 Keywords:                     |        Author:  Jason Grout
 Upstream:  N/A                |      Reviewer:  Joni Syri  
   Merged:  sage-4.4.4.alpha0  |   Work_issues:             
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Comment(by mhansen):

 The patch does return self for immutable matrices.

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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8743#comment:5>
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