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https://issues.apache.org/jira/browse/GROOVY-10767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17608340#comment-17608340
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Eric Milles commented on GROOVY-10767:
--------------------------------------
A couple notes up front:
# B implements A, so it does not need to mention A in the SelfType list
# C implements B but does not extend T, which is a violation of the self-type
metadata
> 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 compilation
> Affects Versions: 3.0.12
> Reporter: Sergey Kachanovskiy
> Assignee: Eric Milles
> Priority: Major
> 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.CompileStatic
> class Groovy10765 {
> trait A {
> void methodA() {
> }
> }
> @groovy.transform.SelfType([A,T])
> trait B implements A {
> void methodB() {
> methodA()
> }
> }
> static class C implements B {
> void method() {
> methodA()
> methodB()
> }
> }
> static class T {
> void methodT() {
> }
> }
> }
> {code}
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