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https://issues.apache.org/jira/browse/GROOVY-10153?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Milles resolved GROOVY-10153.
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Resolution: Information Provided
> STC: cannot combine use-variance with bounded polymorphism
> ----------------------------------------------------------
>
> Key: GROOVY-10153
> URL: https://issues.apache.org/jira/browse/GROOVY-10153
> Project: Groovy
> Issue Type: Bug
> Components: Static compilation, Static Type Checker
> Affects Versions: 4.0.0-alpha-3
> Reporter: Stefanos Chaliasos
> Assignee: Eric Milles
> Priority: Major
>
> I have the following Groovy program.
> {code:groovy}
> @groovy.transform.TypeChecked
> class Test {
> public void m() {
> Foo<? super C> x = new Foo<B>();
> }
> }
> class A {}
> class B extends A {}
> class C extends B {}
> class Foo<T extends A> {
> }
> {code}
> h2. Actual Behavior
> The program does not compile, and I get the following error.
> {code:java}
> org.codehaus.groovy.control.MultipleCompilationErrorsException: startup
> failed:
> Test.groovy: 4: The type ? is not a valid substitute for the bounded
> parameter <T extends A>
> @ line 4, column 9.
> Foo<? super C> x = new Foo<B>();
> ^
> 1 error
> {code}
> h2. Expected Behavior
> Compile successfully.
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