[jira] [Commented] (GROOVY-8330) Wrong 'Inconvertible types' error on casting interface

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/GROOVY-8330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16180888#comment-16180888 ] 

ASF GitHub Bot commented on GROOVY-8330:
----------------------------------------

GitHub user avafanasiev opened a pull request:

    https://github.com/apache/groovy/pull/607

    GROOVY-8330: Wrong 'Inconvertible types' error on casting interface

    Make cast error a little bit like java.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/avafanasiev/groovy master

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/groovy/pull/607.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #607
    
----
commit f30d2e5dd6ce8045eb6656d1993f0dd9b07edfc5
Author: alexey.afanasiev <al...@jetbrains.com>
Date:   2017-09-26T14:43:15Z

    GROOVY-8330: Wrong 'Inconvertible types' error on casting interface

----


> 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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