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https://issues.apache.org/jira/browse/GROOVY-12661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18140661#comment-18140661
]
ASF GitHub Bot commented on GROOVY-12661:
-----------------------------------------
testlens-app[bot] commented on PR #3182:
URL: https://github.com/apache/groovy/pull/3182#issuecomment-6720095777
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> A @PackedClosures closure silently ignores the delegate, owner and thisObject
> passed to rehydrate instead of failing fast like setDelegate
> ------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: GROOVY-12661
> URL: https://issues.apache.org/jira/browse/GROOVY-12661
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 6.0.0
> Reporter: Scott Murphy Heiberg
> Priority: Major
>
> With {{@PackedClosures}} under dynamic compilation,
> {{PackedClosure.setDelegate}} refuses a delegate other than the owner,
> because the hoisted body binds its free names to the owner at compile time.
> {{Closure.rehydrate}} writes the delegate, owner and thisObject fields on the
> copy directly, so it bypasses that guard. The packed body keeps calling the
> original owner, and the new delegate or owner is silently ignored.
> {code:groovy}
> class D { String foo() { 'delegate' } }
> @groovy.transform.PackedClosures
> class O {
> String foo() { 'owner' }
> def m(D d) {
> def c = { -> foo() }
> println c.rehydrate(d, d, d)()
> println c.rehydrate(d, this, this).delegate == d
> c.delegate = d
> }
> }
> new O().m(new D())
> {code}
> *Actual:* prints {{owner}} and {{true}}, then the last line throws
> UnsupportedOperationException ("Cannot set a delegate on a @PackedClosures
> closure ..."). Rehydrating onto another owner of the same class also returns
> the original owner's result.
> *Expected:* rehydrate refuses a delegate, owner or this object the packed
> body cannot honour, with the same UnsupportedOperationException as
> setDelegate. Without the annotation the closure prints {{delegate}}.
> Cause: PackedClosure guards setDelegate and setResolveStrategy but not
> rehydrate, which sets the fields without calling setDelegate.
> Verified on 6.0.0 and master.
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