/*
 * 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.
 *
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 */

/*
 * @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();
    }

}