#11900: Serious regression caused by #9138
-------------------------------------------------------------+--------------
   Reporter:  SimonKing                                      |          Owner:  
tbd                  
       Type:  defect                                         |         Status:  
needs_review         
   Priority:  critical                                       |      Milestone:  
sage-5.0             
  Component:  performance                                    |       Keywords:  
categories regression
Work_issues:  Update reviewer patch                          |       Upstream:  
N/A                  
   Reviewer:  Jeroen Demeyer, Nicolas M. ThiƩry, Simon King  |         Author:  
Simon King           
     Merged:                                                 |   Dependencies:  
#9138 #11911 #9562   
-------------------------------------------------------------+--------------

Comment(by SimonKing):

 Indeed, when simply returning False, one gets an error:
 {{{
 sage -t  devel/sage-main/sage/categories/fields.py
 **********************************************************************
 File "/home/simon/SAGE/sage-4.8.alpha3/devel/sage-
 main/sage/categories/fields.py", line 87:
     sage: GR in Fields()
 Expected:
     True
 Got:
     False
 }}}

 Here, `GR = gap('Rationals')`, equipped with a callable attribute
 `GR.category()` that returns `Fields()`.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11900#comment:200>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
and MATLAB

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