[Bugs] #2698 UNSP: Calculate allows default variables to be redefined

[Sugar Labs Bugs]

#2698: Calculate allows default variables to be redefined
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    Reporter:  greenfeld                  |          Owner:  rwh                        
        Type:  enhancement                |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Calculate                  |        Version:  0.92.x                     
    Severity:  Minor                      |       Keywords:  easy-hack                  
Distribution:  OLPC                       |   Status_field:  Unconfirmed                
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Changes (by humitos):

 * cc: humitos (added)


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Ticket URL: <http://bugs.sugarlabs.org/ticket/2698#comment:4>
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