[Bugs] #2466 UNSP: Calculate does not always return an error for incorrect plot statements

[Sugar Labs Bugs]

#2466: Calculate does not always return an error for incorrect plot statements
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    Reporter:  greenfeld                  |          Owner:  rwh                        
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Calculate                  |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Status_field:  Unconfirmed                |   Distribution:  OLPC                       
   Seeta_dev:                             |  
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 Calculate does not always return an error for incorrect plot statements.
 This has been seen on various OLPC and SoaS builds up to the latest F14
 daily builds with Calculate versions 33 & 34.

 For instance, the following calculate statement lines will not return
 errors or do anything noticeable in the GUI once "Enter" is pressed:

 plot(x*x,x=-5,5) # Should be plot(x*x,x=-5..5)
 plot(x=-5..5,x*x) # Reversed arguments

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2466>
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