def "user can declare and use a custom managed LanguageSourceSet"() {
        given:
        buildFile << """
            @Managed interface CustomManagedLSS extends LanguageSourceSet {
                String getSomeProperty()
                void setSomeProperty(String value)
            }
            class CustomManagedLSSPlugin extends RuleSource {
                @ComponentType

This style of property definition is legacy in Gradle and is discouraged:

[source,java]
----
public class MyTask extends DefaultTask {
    private String someProperty;

    public String getSomeProperty() {
        return someProperty;
    }

    public void setSomeProperty(String someProperty) {
        this.someProperty = someProperty;
    }

    @TaskAction
    public void myAction() {