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https://issues.apache.org/jira/browse/LUCENE-6417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14661427#comment-14661427
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ASF subversion and git services commented on LUCENE-6417:
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Commit 1694615 from [~thetaphi] in branch 'dev/branches/branch_5x'
[ https://svn.apache.org/r1694615 ]
Merged revision(s) 1694614 from lucene/dev/trunk:
LUCENE-6417: Upgrade ANTLR used in expressions module to version 4.5
> Upgrade ANTLR to version 4.5
> ----------------------------
>
> Key: LUCENE-6417
> URL: https://issues.apache.org/jira/browse/LUCENE-6417
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Jack Conradson
> Assignee: Uwe Schindler
> Attachments: LUCENE-6417.patch, LUCENE-6417.patch, LUCENE-6471.patch,
> LUCENE-6471.patch, LUCENE-6471.patch
>
>
> I would like to upgrade ANTLR from 3.5 to 4.5. This version adds several
> features that will improve the existing grammars. The main improvement would
> be the allowance of left-hand recursion in grammar rules which will reduce
> the number of rules significantly for expressions.
> This change will require some code refactoring to the existing expressions
> work.
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