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https://issues.apache.org/jira/browse/GROOVY-11189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17779622#comment-17779622
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Eric Milles commented on GROOVY-11189:
--------------------------------------
https://github.com/apache/groovy/commit/7a240549c04eabbf9e24138a9119e8ac3cade049
> STC LUB of List and Set is not Collection for Java 21
> -----------------------------------------------------
>
> Key: GROOVY-11189
> URL: https://issues.apache.org/jira/browse/GROOVY-11189
> Project: Groovy
> Issue Type: Bug
> Components: Static Type Checker
> Affects Versions: 5.0.0-alpha-2, 4.0.15
> Reporter: Eric Milles
> Assignee: Eric Milles
> Priority: Major
> Fix For: 5.0.0-alpha-3, 4.0.16
>
>
> The new {{SequencedCollection}} interface introduced in Java 21 has altered
> the type inference results for mixed use of {{List}} and {{Set}}. Consider
> the following:
> {code:groovy}
> def x
> x = [] as List
> if (predicate()) {
> x = [] as Set
> }
> x
> {code}
> Under STC, the inferred type of the last occurrence of "x" has changed from
> {{Collection}} to {{Object}}.
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