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https://issues.apache.org/jira/browse/GROOVY-10433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17466853#comment-17466853
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Paul King commented on GROOVY-10433:
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Adding "sealed" into the list of identifiers in the grammar makes the compiler
behave in the same was as the other restricted identifiers:
{code}
def sealed() { false }
this.sealed()
{code}
So, you can define the method but still need the qualifier when calling it.
For your other example, "non-sealed" is then still flagged as a keyword but
adding some whitespace is a workaround:
{code}
def clos = { non, sealed -> return non - sealed }
assert 6 == clos(10, 4)
{code}
> "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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