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https://issues.apache.org/jira/browse/LUCENE-6417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14642092#comment-14642092
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Uwe Schindler edited comment on LUCENE-6417 at 7/26/15 9:03 PM:
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Hi Jack, I will tomorrow look into the ASM parts. I rewrote that after the code 
donation from A9 with Robert. I just want to make sure the Java Bytecode is 
created in most efficient way :-) Did you change the code in general or is this 
just moving the byte code generator fragments around in the code?


was (Author: thetaphi):
I Jack, I will tomorrow look into the ASM parts. I rewrote that after the code 
donation from A9 with Robert. I just want to make sure the Java Bytecode is 
created in most efficient way :-) Did you change the code in general or is this 
just moving the byte code generator fragments around in the code?

> 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
>         Attachments: 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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