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https://issues.apache.org/jira/browse/LUCENE-9528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17200078#comment-17200078
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Robert Muir commented on LUCENE-9528:
-------------------------------------

Their explanation: 
https://github.com/antlr/antlr4/blob/master/doc/faq/general.md#what-is-the-difference-between-antlr-3-and-4



> Clean up obsolete and commented-out cruft from StandardSyntaxParser.jj
> ----------------------------------------------------------------------
>
>                 Key: LUCENE-9528
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9528
>             Project: Lucene - Core
>          Issue Type: Sub-task
>            Reporter: Dawid Weiss
>            Assignee: Dawid Weiss
>            Priority: Minor
>             Fix For: master (9.0)
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> The indentation in that file is crazy. So are micro-optimizations which make 
> reading the syntax parser much more difficult than it actually is.



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