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https://issues.apache.org/jira/browse/GROOVY-10082?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King closed GROOVY-10082.
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> Incompatible generic argument types when combining subtyping and closures
> -------------------------------------------------------------------------
>
> Key: GROOVY-10082
> URL: https://issues.apache.org/jira/browse/GROOVY-10082
> Project: Groovy
> Issue Type: Bug
> Components: Static Type Checker
> Reporter: Thodoris Sotiropoulos
> Assignee: Eric Milles
> Priority: Major
> Fix For: 4.0.0-beta-1
>
>
> I have the following program
>
> {code:java}
> class A {}
> class B extends A {}
> class Main {
> public static void main(String[] args) {
> Closure<A> cls = { -> {
> final A x = new B()
> x
> }}
> }
> }
> {code}
>
> h3. Actual Behaviour
> {code:java}
> org.codehaus.groovy.control.MultipleCompilationErrorsException: startup
> failed:
> test.groovy: 7: [Static type checking] - Incompatible generic argument types.
> Cannot assign groovy.lang.Closure<B> to: groovy.lang.Closure<A>
> @ line 7, column 22.
> Closure cls = { -> {
> ^
> 1 error
> {code}
> h3. Expected Behaviour
> Compile successfully
>
> I don't know if this behaviour is intended due to flow typing.
> Tested against master
> ([https://github.com/apache/groovy/commit/8830e47c3dbd5914e52330d4263c34bcfd05752d])
>
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