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https://issues.apache.org/jira/browse/GROOVY-11815?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Milles resolved GROOVY-11815.
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Fix Version/s: 5.0.4
Resolution: Fixed
https://github.com/apache/groovy/commit/cc8bc3e408f5bc7a6779c70f11a29a4cffdf04a8
> STC: flow type after instanceof drops type args
> -----------------------------------------------
>
> Key: GROOVY-11815
> URL: https://issues.apache.org/jira/browse/GROOVY-11815
> Project: Groovy
> Issue Type: Bug
> Components: Static Type Checker
> Reporter: Eric Milles
> Assignee: Eric Milles
> Priority: Major
> Fix For: 5.0.4
>
>
> Consider the following:
> {code:groovy}
> @TypeChecked
> void test(flag) {
> def x = flag ? new ArrayDeque<Number>() : new Stack<Number>()
> if (x instanceof Deque) {
> x
> }
> }
> {code}
> The type of "x" in the then block is "AbstractCollection<E>" when
> "AbstractCollection<Number>" is expected.
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