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https://issues.apache.org/jira/browse/GROOVY-10433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17466572#comment-17466572
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Eric Milles commented on GROOVY-10433:
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I wouldn't expect "def private = ..." to work. It has been a keyword /
reserved word from the very start of Java (and Groovy). I think only "var",
"record", "sealed", "permits" and soon "_" are so-called restricted
identifiers. They can be used as identifiers but serve as keywords in specific
circumstances.
> "sealed" not usable as a restricted identifier
> ----------------------------------------------
>
> Key: GROOVY-10433
> URL: https://issues.apache.org/jira/browse/GROOVY-10433
> Project: Groovy
> Issue Type: Bug
> Components: parser-antlr4
> Affects Versions: 4.0.0-rc-2
> Reporter: Eric Milles
> Priority: Major
>
> The restricted identifier "sealed" is not usable for a variable or member
> name any longer.
> {code:groovy}
> def sealed = false // fails to parse
> def record = false // okay
> def permits = false // okay
> class C {
> def sealed = false // fails to parse
> def record = false // okay
> def permits = false // okay
> }
> {code}
> And this should still work as minus: "\{ non, sealed -> return non-sealed \}"
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