[jira] [Commented] (GROOVY-10767) Cannot find matching method when trait that implements another trait is compiled statically

["Sergey Kachanovskiy (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/GROOVY-10767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17632550#comment-17632550 ] 

Sergey Kachanovskiy commented on GROOVY-10767:
----------------------------------------------

[~emilles] could you please clarify the following: can adding A into SelfType of B be considered a safe workaround, provided that no class implementing B ever directly implements A?

thank you.

> Cannot find matching method when trait that implements another trait is compiled statically
> -------------------------------------------------------------------------------------------
>
>                 Key: GROOVY-10767
>                 URL: https://issues.apache.org/jira/browse/GROOVY-10767
>             Project: Groovy
>          Issue Type: Bug
>          Components: Static Type Checker
>    Affects Versions: 3.0.12
>            Reporter: Sergey Kachanovskiy
>            Assignee: Eric Milles
>            Priority: Major
>              Labels: traits
>             Fix For: 2.5.19, 3.0.14
>
>         Attachments: GROOVY-10767.tar.gz
>
>
> I have a trait that implements another trait, and when i try to statically compile it with groovy 3.0.12, it throws the following error:
> {code}
> org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
> B.groovy: 12: [Static type checking] - Cannot find matching method <UnionType:test.T+test.B>#methodA(). Please check if the declared type is correct and if the method exists.
>  @ line 12, column 3.
>                 methodA()
>      ^
> 1 error
> {code}
> test case files attached. compilation:
> {code}
> JAVA_HOME=/groovy-test/jdk8u275-b01 /groovy-test/groovy-3.0.12/bin/groovyc -classpath /groovy-test/src B.groovy
> {code}
> all works good with 2.5.14
> when I add A into SelfType in B (so that it looks like @SelfType([T,A]), all compiles ok with 3.0.12 too.
> question: can adding A into SelfType be considered a safe workaround, provided that no class implementing B ever directly implements A?
> {code:groovy}
> @groovy.transform.TypeChecked
> class Groovy10767 {
>   trait A {
>     void methodA() {
>     }
>   }
>   @groovy.transform.SelfType(T)
>   trait B implements A {
>     void methodB() {
>       methodA() // Cannot find matching method <UnionType:T+B>#methodA()
>     }
>   }
>   static class C implements B {
>     void method() {
>       methodA()
>       methodB()
>     }
>   }
>   static class T {
>     void methodT() {
>     }
>   }
> }
> {code}



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