[jira] [Closed] (GROOVY-10082) Incompatible generic argument types when combining subtyping and closures

["Paul King (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GROOVY-10082?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Paul King closed GROOVY-10082.
------------------------------

> 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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