test/langtools/tools/javac/generics/inference/6650759/T6650759c.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).
 *
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 * 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     6650759
 * @summary Inference of formal type parameter (unused in formal parameters) is not performed
 * @compile T6650759c.java
 */

import java.util.Collection;
import java.util.Collections;

public class T6650759c {

  static interface A {}

  static interface B<X extends A> {}

  static interface C<X extends A, Y extends B<X>> {}

  public static <T extends A, U extends B<T>> Collection<C<T,U>> get(U u) {
    return null;
  }

  public <T extends A, U extends B<T>> Collection<C<T,U>> test(U u) {
    return Collections.unmodifiableCollection(get(u));
  }
}