[GROOVY-10144] Calling method on specific trait fails when on different files

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.7
• Fix Version/s: 4.0.0-rc-2
• Component/s: parser-antlr4
• Labels: trait traits
• Environment: macOS 10.15.7, groovy 3.0.7, AdoptOpenJDK)(build 1.8.0_282-b08)
• Assignee: Eric Milles
• Reporter: João Nelas
• Created: 18/Jun/21 14:10
• Updated: 03/Feb/22 22:29
• Resolved: 20/Dec/21 13:47

Description

When calling a method on a specific trait, via the manual conflict resolution syntax, it fails with The usage of 'Class.this' and 'Class.super' is only allowed in nested/inner classes..

T.groovy

trait T {
    void exec() {
        println("T - exec");
    }
}

A.groovy

class A implements T{
    void exec() {
        println("A - exec");
        T.super.exec();
    }
}

diff_files.groovy

import A;

new A().exec();

Running diff_files.groovy gives an error:

> groovy diff_files.groovy
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
file:/Users/joao/tmp/groovy_trait/A.groovy: 6: The usage of 'Class.this' and 'Class.super' is only allowed in nested/inner classes.
 @ line 6, column 10.
           T.super.exec();
            ^

1 error

If everything is included on the same file
onefile.groovy

trait T {
    void exec() {
        println("T - exec");
    }
}

class A implements T{
    void exec() {
        println("A - exec");
        T.super.exec();
    }
}

new A().exec();

everything works as expected:

>groovy onefile.groovy
A - exec
T - exec