Bug 427478

Description Markus Keller 2014-02-05 10:26:12 EST

When trying to compile rt.jar of Java 8 with ecj, I'm getting a compile error in java.util.Spliterators.AbstractDoubleSpliterator. I've extracted the problem into a self-contained example below.

I think the compile error is wrong because interface OfDouble already overrides the method Spliterator#forEachRemaining(Consumer<? super T>) with a concrete variant OfDouble#forEachRemaining(Consumer<? super Double>), so the former method should not be considered any more when AbstractDoubleSpliterator is compiled.

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package split2;

import java.util.function.Consumer;
import java.util.function.DoubleConsumer;

public interface Spliterator<T> {
    
    default void forEachRemaining(Consumer<? super T> action) {
    }
    
    public interface OfPrimitive<T, T_CONS, T_SPLITR extends OfPrimitive<T, T_CONS, T_SPLITR>>
            extends Spliterator<T> {
        // overloads Spliterator#forEachRemaining(Consumer<? super T>)
        default void forEachRemaining(T_CONS action) {
        }
    }
    
    public interface OfDouble extends OfPrimitive<Double, DoubleConsumer, OfDouble> {
        @Override // the method from Spliterator
        default void forEachRemaining(Consumer<? super Double> action) {
        }
        
        @Override // the method from OfPrimitive
        default void forEachRemaining(DoubleConsumer action) {
        }
    }
}

class Spliterators {
    /* Error on class: Duplicate default methods named forEachRemaining with
     * the parameters (Consumer<? super Double>) and (Consumer<? super T>) are
     * inherited from the types Spliterator.OfDouble and Spliterator<Double>
     */
    public abstract static class AbstractDoubleSpliterator implements Spliterator.OfDouble {

        /* Implementation that prevents the compile error: */
//        @Override // the method from Spliterator
//        public void forEachRemaining(Consumer<? super Double> action) {
//        }
    }
}
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