tkobayas opened a new issue, #6221:
URL: https://github.com/apache/incubator-kie-drools/issues/6221

   As discussed in 
https://lists.apache.org/thread/fj2vtdlmb98xlw6l97r4qscsproz0jq1 , we will 
introduce New Antlr4 Parser with a gradual approach.
   
   1. Introduce the new parser(DRL10), but make it optional (not enabled by 
default).
   2. Raise warnings when the syntax to be dropped are used **in the old DRL6 
parser**, saying these syntax are deprecated.
      Raise warnings when DRL5 and DRL6_STRICT are used, saying these language 
levels are deprecated.
   
   (six months later)
   
   3. Raise warnings when DRL6 is used, saying DRL10 will be the default in the 
future
   
   (six months later)
   
   4. Make the new parser(DRL10) default
   
   (x months later)
    
   5. In the next major release (version 11), drop the old DRL5 andDRL6_STRICT 
parsers
   
   (x months later)
    
   6. In the major release after that (version 12), drop the old DRL6 parser, 
it means the deprecated syntax cannot be used at this point.
   


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