Tue, 16 Jun 2009 10:46:37 +0100
6638712: Inference with wildcard types causes selection of inapplicable method
Summary: Added global sanity check in order to make sure that return type inference does not violate bounds constraints
Reviewed-by: jjg
1 /*
2 * Copyright 2002-2004 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
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22 */
24 /*
25 * @test
26 * @bug 4736963
27 * @summary Positive regression test from odersky
28 * @author odersky
29 *
30 * @compile Test.java
31 */
33 class Test {
35 static <B> List<B> nil() { return new List<B>(); }
36 static <A> List<A> cons(A x, List<A> xs) { return xs.prepend(x); }
37 static <A> Cell<A> makeCell(A x) { return new Cell<A>(x); }
38 static <A> A id(A x) { return x; }
40 public static void main(String[] args) {
41 List<String> xs = nil();
42 List<String> ys = cons("abc", Test.<String>nil());
43 List<String> zs = Test.<String>nil().prepend("abc");
45 System.out.println(nil());
46 System.out.println(nil().length());
48 System.out.println(cons("abc", nil()));
49 System.out.println(nil().prepend("abc"));
50 System.out.println(nil().prepend(makeCell(null)));
51 System.out.println(cons(makeCell(null), nil()));
53 System.out.println(id(nil()));
54 System.out.println(id(nil()).length());
56 System.out.println(cons("abc", id(nil())));
57 System.out.println(id(nil()).prepend("abc"));
58 System.out.println(id(nil()).prepend(makeCell(null)));
59 System.out.println(cons(makeCell(null), id(nil())));
61 List<String> a =
62 args.length == 1 ? Test.<String>nil() : Test.<String>nil();
63 a = (List<String>) Test.<String>nil();
64 }
66 }