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https://issues.apache.org/jira/browse/GROOVY-10477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Milles resolved GROOVY-10477.
----------------------------------
    Fix Version/s: 5.0.0-alpha-1
       Resolution: Fixed

https://github.com/apache/groovy/commit/999a81be1afeb8aff26b1cfe1c81dbd891c4b0e2

> SC: optimize for-in loop on array with dynamic variable
> -------------------------------------------------------
>
>                 Key: GROOVY-10477
>                 URL: https://issues.apache.org/jira/browse/GROOVY-10477
>             Project: Groovy
>          Issue Type: Improvement
>            Reporter: Eric Milles
>            Assignee: Eric Milles
>            Priority: Major
>             Fix For: 5.0.0-alpha-1
>
>
> Consider the following:
> {code:groovy}
> @groovy.transform.CompileStatic
> void test(String[] strings) {
>   for (string in strings) {
>     // ...
>   }
> }
> {code}
> This code does not write an optimized array-based iteration since the type of 
> "string" isn't explicitly declared. "for (String string in strings)" and "for 
> (String string : strings)" are so optimized.



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