#13501: Fix two bugs in sage.misc.c3's implementation of the algorithm C3
-------------------------------------------------+--------------------------
       Reporter:  nthiery                        |         Owner:            
           Type:  defect                         |        Status:  needs_work
       Priority:  major                          |     Milestone:  sage-5.4  
      Component:  categories                     |    Resolution:            
       Keywords:  method resolution order        |   Work issues:            
Report Upstream:  N/A                            |     Reviewers:  Simon King
        Authors:  Nicolas M. ThiƩry, Simon King  |     Merged in:            
   Dependencies:                                 |      Stopgaps:            
-------------------------------------------------+--------------------------
Changes (by jdemeyer):

  * status:  positive_review => needs_work


Comment:

 I'm getting a long doctest error:
 {{{
 sage -t  --long -force_lib devel/sage/sage/misc/c3.pyx
 **********************************************************************
 File "/release/merger/sage-5.4.beta2/devel/sage-main/sage/misc/c3.pyx",
 line 152:
     sage: class A(B, C): pass
 Expected:
     Traceback (most recent call last):
     ...
     TypeError: Error when calling the metaclass bases
         Cannot create a consistent method resolution
     order (MRO) for bases B, C
 Got:
     Traceback (most recent call last):
       File "/release/merger/sage-5.4.beta2/local/bin/ncadoctest.py", line
 1231, in run_one_test
         self.run_one_example(test, example, filename, compileflags)
       File "/release/merger/sage-5.4.beta2/local/bin/sagedoctest.py", line
 38, in run_one_example
         OrigDocTestRunner.run_one_example(self, test, example, filename,
 compileflags)
       File "/release/merger/sage-5.4.beta2/local/bin/ncadoctest.py", line
 1172, in run_one_example
         compileflags, 1) in test.globs
       File "<doctest __main__.example_1[35]>", line 1, in <module>
         class A(B, C): pass###line 152:
     sage: class A(B, C): pass
     TypeError: Error when calling the metaclass bases
         Cannot create a consistent method resolution
     order (MRO) for bases C, B
 **********************************************************************
 }}}

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13501#comment:32>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
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