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6835428: regression: return-type inference rejects valid code

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Redundant subtyping test during type-inference ends up in rejecting legal code

Reviewed-by: jjg
This commit is contained in:
Maurizio Cimadamore 2009-06-16 10:46:16 +01:00
parent 5f7f3d4e38
commit fda3d758e3
2 changed files with 39 additions and 2 deletions
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3
langtools/src/share/classes/com/sun/tools/javac/comp/Infer.java
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@ -158,8 +158,7 @@ public class Infer {
that.inst = types.glb(that.hibounds);
}
if (that.inst == null ||
that.inst.isErroneous() ||
!types.isSubtypeUnchecked(that.inst, that.hibounds, warn))
that.inst.isErroneous())
throw ambiguousNoInstanceException
.setMessage("no.unique.maximal.instance.exists",
that.qtype, that.hibounds);

38
langtools/test/tools/javac/generics/inference/T6835428.java Normal file
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@ -0,0 +1,38 @@
/*
* Copyright 2009 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 6835428
* @author mcimadamore
* @summary regression: return-type inference rejects valid code
* @compile T6835428.java
*/
class T6835428<T> {
interface X<T> {}
<T extends Comparable<? super T>> T6835428<X<T>> m() { return null; }
<T extends Comparable<? super T>> void test() {
T6835428<X<T>> t = m();
}
}