For ease of migration, we should consider having javac emit a warning rather than an error, when old/retired -source and -target options are specified.  
            
- relates to
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                    JDK-8011044 Remove support for 1.5 and earlier source and target options -           
- Closed
 
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- 
                    JDK-8046172 JEP 182: Policy for Retiring javac -source and -target Options -           
- Draft
 
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 P2
  P2