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https://issues.apache.org/jira/browse/GROOVY-7774?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King closed GROOVY-7774.
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> Collection addAll fails CompileStatic type checking when adding a collection
> of subtypes
> ----------------------------------------------------------------------------------------
>
> Key: GROOVY-7774
> URL: https://issues.apache.org/jira/browse/GROOVY-7774
> Project: Groovy
> Issue Type: Bug
> Components: groovy-jdk
> Affects Versions: 2.4.3
> Environment: Windows, Java 8.
> Reporter: Darren Hurt
> Assignee: Paul King
> Fix For: 2.4.8
>
>
> Suppose X is an interface and Y an interface such that Y extends X
> The following code throws a compilation error (the outer class is annotated
> as @CompileStatic).
> {code}
> Set<X> set = new HashSet<X>()
> Set<Y> toAdd = ......
> set.addAll(toAdd)
> {code}
> However, the following works, which to me is inconsistent:
> {code}
> Set<X> set = new HashSet<X>()
> Set<Y> toAdd = ......
> for(Y y in toAdd) {
> set.add(y)
> }
> {code}
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