[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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Comment(by walter):

 Not sure I agree, It would be interest to let the learner explore what
 happens if you, for example, redefine pi as 3 (As I recall, Alabama did
 this once [1] -- don't use bridges in Alabama). Seriously though. Why not
 see how it screws things up? That said, an alert warning that this is not
 a good idea would be appropriate. The alert mechanism is pretty straight-
 forward.

 [1] http://www.scambusters.org/hoaxes.html

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2698#comment:3>
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