DirectSupersOfErr.java

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/*
 * @test
 * @bug     6346973
 * @summary directSupertypes(t) should not return t
 * @author  Scott Seligman
 * @library /tools/javac/lib
 * @modules java.compiler
 *          jdk.compiler
 * @build   JavacTestingAbstractProcessor DirectSupersOfErr
 * @compile/fail/ref=DirectSupersOfErr.ref -processor DirectSupersOfErr -proc:only -XDrawDiagnostics C1.java
 */

import java.util.Set;
import javax.annotation.processing.*;
import javax.lang.model.element.*;
import javax.lang.model.type.*;
import javax.lang.model.util.*;
import static javax.lang.model.util.ElementFilter.*;

public class DirectSupersOfErr extends JavacTestingAbstractProcessor {
    public boolean process(Set<? extends TypeElement> tes,
                           RoundEnvironment round) {
        if (round.processingOver()) return true;

        for (TypeElement te : typesIn(round.getRootElements())) {
            TypeMirror sup = te.getSuperclass();
            for (TypeMirror supOfSup : types.directSupertypes(sup)) {
                if (sup == supOfSup)
                    throw new AssertionError("I'm my own supertype.");
            }
        }
        return true;
    }
}