test/tools/javac/generics/wildcards/BoundBug.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 4890134
 * @summary generics: used of ? get bound error
 * @author gafter
 *
 * @compile  BoundBug.java
 */

class BoundBug {
    class C {}

    class B<T extends C>
    {
        void foo() {
            B<? super T> con = null;   //ok
            B<? extends T> cov = null; //ok
            B<?>  biv = null;          //fails
            B<T>  inv = null;
        }
    }

    static
    {
        B<? super C> con = null;    //ok
        B<? extends C> cov = null;  //ok
        B<?>  biv = null;           //fails
        B<C>  inv = null;
    }
}