test/langtools/tools/javac/capture/Capture5.java

/*
 * Copyright (c) 2004, Oracle and/or its affiliates. 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 4916650
 * @summary wildcards versus recursive F-bounds
 * @author Peter von der Ahe
 *
 * @compile Capture5.java
 */

package capture5;

interface R<T extends R<T>> {}
class A implements R<A> {}
class B<T> implements R<B<T>> {}
class C implements R<C> {}

class Recursive {
    <t> t choose(t x, t y) {
        return x;
    }
    void f(boolean b1, boolean b2, boolean b3, A a, B<String> b, C c) {
        R<? extends R<? extends R<? extends R<? extends R<?>>>>> r = null;
        r = b2 ? a : b;
        r = b1 ? (b2 ? a : b) : (b3 ? b : c);
        r = choose(a,c);
        r = choose(choose(a,b), choose(b,c));
    }
}