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https://issues.apache.org/jira/browse/GROOVY-2840?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King closed GROOVY-2840.
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> Support "not" for in and instanceof 
> ------------------------------------
>
>                 Key: GROOVY-2840
>                 URL: https://issues.apache.org/jira/browse/GROOVY-2840
>             Project: Groovy
>          Issue Type: New Feature
>          Components: syntax
>    Affects Versions: 1.5.6, 1.6-beta-1
>            Reporter: Mingfai Ma
>            Assignee: Daniel Sun
>            Priority: Major
>             Fix For: 2.6.0-alpha-1
>
>
> It would be nice if we could use:
> - (3 !in [2,3,4]) or (3 not in [2,3,4])  instead of  (!(3 in [2,3,4]))   
> - also for instanceof 
> Remarks:
> - It doesn't look like a big issue if it's just "!(x in ['x'])", but when the 
> line is longer and more complex and when use together with other parenthesis, 
> skipping one pair of parenthesis means a lot in code clarity. It's just like 
> in SQL, we can add a NOT to NOT LIKE or NOT IN.
> Reference: 
> http://www.nabble.com/Groovy-syntax--API-enhancement-td16796998.html#a16810531



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