/*

 * Copyright 2002-2004 Sun Microsystems, Inc.  All Rights Reserved.

 * 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.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

/*

 * @test

 * @bug 4736963

 * @summary Positive regression test from odersky

 * @author odersky

 *

 * @compile -source 1.5 Test.java

 */

class Test {

    static <B> List<B> nil() { return new List<B>(); }

    static <A> List<A> cons(A x, List<A> xs) { return xs.prepend(x); }

    static <A> Cell<A> makeCell(A x) { return new Cell<A>(x); }

    static <A> A id(A x) { return x; }

    public static void main(String[] args) {

        List<String> xs = nil();

        List<String> ys = cons("abc", Test.<String>nil());

        List<String> zs = Test.<String>nil().prepend("abc");

        System.out.println(nil());

        System.out.println(nil().length());

        System.out.println(cons("abc", nil()));

        System.out.println(nil().prepend("abc"));

        System.out.println(nil().prepend(makeCell(null)));

        System.out.println(cons(makeCell(null), nil()));

        System.out.println(id(nil()));

        System.out.println(id(nil()).length());

        System.out.println(cons("abc", id(nil())));

        System.out.println(id(nil()).prepend("abc"));

        System.out.println(id(nil()).prepend(makeCell(null)));

        System.out.println(cons(makeCell(null), id(nil())));

        List<String> a =

            args.length == 1 ? Test.<String>nil() : Test.<String>nil();

        a = (List<String>) Test.<String>nil();

    }

}