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https://issues.apache.org/jira/browse/JEXL-307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17133536#comment-17133536
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Henri Biestro commented on JEXL-307:
------------------------------------

Changeset: 066919bec45d8d65dcf2f7d8f1ad890efeb4b6e1
Author:    henrib <[email protected]>
Date:      2020-06-11 16:41
Message:   JEXL-307: commented templates throw NPE due to missing expected scope

> Variable redeclaration option
> -----------------------------
>
>                 Key: JEXL-307
>                 URL: https://issues.apache.org/jira/browse/JEXL-307
>             Project: Commons JEXL
>          Issue Type: New Feature
>    Affects Versions: 3.1
>            Reporter: Dmitri Blinov
>            Assignee: Henri Biestro
>            Priority: Major
>             Fix For: 3.2
>
>
> As of now, JEXL allows a script writer to redeclare a local variable during 
> script evaluation.
> {code:java}
> var a = 1; var a = 2;{code}
> This may lead to potential errors with misspelled names and clashed 
> variables. Checking for already defined variable is a common feature of many 
> languages. This feature can be implemented in JEXL as an additional option of 
> JexlFeatures class, enabled by default, thus allowing compatibility with 
> existing code.



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