[Parrot] #34: [PIR] deprecate index syntax for substr

[Parrot]

#34: [PIR] deprecate index syntax for substr
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 Reporter:  parrotcode at gmail.com  |        Type:  todo  
   Status:  new                   |    Priority:  normal
Milestone:                        |   Component:  core  
  Version:                        |    Severity:  low   
 Keywords:  PIR                   |        Lang:        
    Patch:                        |    Platform:        
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 In PDD19 it says:

 {{ DEPRECATION NOTE: Possibly deprecate the substring variant. }}

 This should be implemented (or rather, imcc.y should be tweaked so that
 $S0[10] no longer maps to a substr op.

 kjs

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Ticket URL: <https://trac.parrot.org/parrot/ticket/34>
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