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https://issues.apache.org/jira/browse/GROOVY-8330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16182089#comment-16182089
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ASF GitHub Bot commented on GROOVY-8330:
----------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/groovy/pull/607
> Wrong 'Inconvertible types' error on casting interface
> -------------------------------------------------------
>
> Key: GROOVY-8330
> URL: https://issues.apache.org/jira/browse/GROOVY-8330
> Project: Groovy
> Issue Type: Bug
> Components: Static compilation, Static Type Checker
> Affects Versions: 2.4.12
> Reporter: Alexey Afanasiev
>
> {code}
> import groovy.transform.CompileStatic
> interface A1{}
> interface A2 extends A1{}
>
> class C1 implements A1{}
> class C2 extends C1 implements A2 {}
>
> @CompileStatic
> def m(A2 a2) {
> C1 c1 = (C1) a2 // There is error here now: Inconvertible types:
> cannot cast A2 to C1
> }
> {code}
> JLS handle this situation in 5.1.6.1 :
> A narrowing reference conversion exists from reference type S to reference
> type T
> if ...... - S is an interface type, T is a class type, and T does not name a
> final class.
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