diff -r a54ef8459576 -r c0372d1097c0 test/tools/javac/generics/T6751514.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/tools/javac/generics/T6751514.java	Thu Oct 09 15:56:20 2008 +0100
@@ -0,0 +1,82 @@
+/*
+ * Copyright 2008 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     6751514
+ * @summary Unary post-increment with type variables crash javac during lowering
+ * @author Maurizio Cimadamore
+ */
+
+public class T6751514 {
+
+    static class Foo<X> {
+        X x;
+        Foo (X x) {
+            this.x = x;
+        }
+    }
+
+    static void test1(Foo<Integer> foo) {
+        int start = foo.x;
+        equals(foo.x += 1, start + 1);
+        equals(foo.x++, start + 1);
+        equals(++foo.x, start + 3);
+        equals(foo.x--, start + 3);
+        equals(foo.x -= 1, start + 1);
+        equals(--foo.x, start);
+    }
+
+    static void test2(Foo<Integer> foo) {
+        int start = foo.x;
+        equals((foo.x) += 1, start + 1);
+        equals((foo.x)++, start + 1);
+        equals(++(foo.x), start + 3);
+        equals((foo.x)--, start + 3);
+        equals((foo.x) -= 1, start + 1);
+        equals(--(foo.x), start);
+    }
+
+    static void test3(Foo<Integer> foo) {
+        int start = foo.x;
+        equals(((foo.x)) += 1, start + 1);
+        equals(((foo.x))++, start + 1);
+        equals(++((foo.x)), start + 3);
+        equals(((foo.x))--, start + 3);
+        equals(((foo.x)) -= 1, start + 1);
+        equals(--((foo.x)), start);
+    }
+
+    public static void main(String[] args) {
+        test1(new Foo<Integer>(1));
+        test2(new Foo<Integer>(1));
+        test3(new Foo<Integer>(1));
+    }
+
+    static void equals(int found, int req) {
+        if (found != req) {
+            throw new AssertionError("Error (expected: "+ req +
+                                     " - found: " + found + ")");
+        }
+    }
+}
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