test/langtools/tools/javac/generics/8064803/T8064803.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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/*
 * @test
 * @bug 8064803
 * @summary Javac erroneously uses instantiated signatures when merging abstract most-specific methods
 */
public class T8064803 {
    interface ParentA<T> {
        T process() throws Exception;
    }

    interface ParentB<T> {
        T process() throws Exception;
    }

    interface Child<T> extends ParentA<T>, ParentB<T> { }

    static class ChildImpl<T> implements Child<T> {
        @Override
        public T process() {
            return null;
        }
    }

    public static void main(String[] args) throws Exception {
        Child<String> child = new ChildImpl<String>();
        child.process();
    }
}