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https://issues.apache.org/jira/browse/GROOVY-8127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15937158#comment-15937158
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Paul King commented on GROOVY-8127:
-----------------------------------
Just mentioning the workarounds: remove final (both cases) or remove
@CompileStatic (first case). Groovy 2.4.7 allowed the {{final}} keyword but
ignored it. The later versions now apply that modifier.
> Access to Trait$Trait$Helper#$self is forbidden
> -----------------------------------------------
>
> Key: GROOVY-8127
> URL: https://issues.apache.org/jira/browse/GROOVY-8127
> Project: Groovy
> Issue Type: Bug
> Components: Compiler
> Affects Versions: 2.4.10
> Reporter: François Guillot
>
> I'm switching from Groovy 2.4.7 to 2.4.10 in my project.
> I have a compile error with 2.4.10.
> Simplified example:
> {code}
> import groovy.transform.CompileStatic
> import org.junit.Rule
> import org.junit.rules.TestRule
> @CompileStatic
> trait FooTrait {
> @Rule
> public final TestRule foo = {} as TestRule
> }
> {code}
> I get "Error:Groovyc: Access to FooTrait$Trait$Helper#$self is forbidden"
> Another variant of this error is "Error:Groovyc: Apparent variable '$self'
> was found in a static scope but doesn't refer to a local variable, static
> field or class."
> This second error happens with the following code
> {code}
> import groovy.transform.CompileStatic
> import org.junit.Rule
> import org.junit.rules.TestRule
> import org.junit.runner.Description
> import org.junit.runners.model.Statement
> @CompileStatic
> trait TestSupport {
> boolean failOnResourceLeak = true
> @Rule
> public final TestRule leakDetectionFlagRule = { Statement base,
> Description description ->
> return {
> base.evaluate()
> if (failOnResourceLeak) {
> throw new Exception("A resource has leaked in this test!")
> }
> } as Statement
> } as TestRule
> }
> {code}
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