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https://issues.apache.org/jira/browse/GROOVY-9073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16822978#comment-16822978
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Paul King commented on GROOVY-9073:
-----------------------------------
Setting the environment variable {{JAVA_OPTS}} to also include
{{--enable-preview}} is enough for the cases I mentioned above to work and I
believe is sufficient for groovyConsole also. I don't think groovydoc is
currently affected. I haven't checked joint compilation passes the correct info
through to the java compiler yet.
> Support preview features in compiled classes
> --------------------------------------------
>
> Key: GROOVY-9073
> URL: https://issues.apache.org/jira/browse/GROOVY-9073
> Project: Groovy
> Issue Type: Improvement
> Components: Compiler
> Reporter: Keegan Witt
> Assignee: Keegan Witt
> Priority: Major
> Fix For: 3.0.0-beta-1, 2.5.7
>
> Attachments: groovy9073_tweaks.patch
>
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> In order to support the preview features ([JEP
> 12|https://openjdk.java.net/jeps/12]), we need a new compiler flag to set the
> [V_PREVIEW|https://asm.ow2.io/javadoc/org/objectweb/asm/Opcodes.html#V_PREVIEW]
> opcode (to achieve the equivalent of {{--enable-preview}} mentioned in
> [JDK-8195734|https://bugs.openjdk.java.net/browse/JDK-8195734]).
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