[jira] [Commented] (GROOVY-10011) Combining flow typing and type argument inference does not work as expected

["Eric Milles (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/GROOVY-10011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17315577#comment-17315577 ] 

Eric Milles commented on GROOVY-10011:
--------------------------------------

If you want to do something like GROOVY-9996 inside the {{instanceof}} block, it will be hard to support this as well.

> Combining flow typing and type argument inference does not work as expected
> ---------------------------------------------------------------------------
>
>                 Key: GROOVY-10011
>                 URL: https://issues.apache.org/jira/browse/GROOVY-10011
>             Project: Groovy
>          Issue Type: Bug
>          Components: Static Type Checker
>            Reporter: Thodoris Sotiropoulos
>            Assignee: Eric Milles
>            Priority: Major
>
> I have the following program
> {code:java}
> class A<T> {
>   T f;
>   public A(T f) {
>     this.f = f;
>   }
> }
> class Foo {}
> class Bar extends Foo {}
> public class Main {
>   public static void bar(Foo x) {
>     if (x instanceof Bar) {
>       A<Bar> a = new A<>(x)
>     }
>   }
> }
> {code}
> h3. Actual Behavior
> {code:java}
> org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
> test.groovy: 15: [Static type checking] - Incompatible generic argument types. Cannot assign A <Foo> to: A <Bar>
>  @ line 15, column 18.
>          A<Bar> a = new A<>(x)
>                     ^1 error
> {code}
> h3. Expected Behavior
> Compile successfully
>  
> Tested against https://github.com/apache/groovy/commit/359be2b662be646d2d59db8b999412691891231d



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