6718364: inference fails when a generic method is invoked with raw arguments

Summary: Bug in the implementation of Types.isSubtypeUnchecked
Reviewed-by: jjg

src/share/classes/com/sun/tools/javac/code/Types.java

@@ -305,6 +305,11 @@ public class Types {
         else if (t.tag == TYPEVAR) {
             return isSubtypeUnchecked(t.getUpperBound(), s, warn);
         }
+        else if (s.tag == UNDETVAR) {
+            UndetVar uv = (UndetVar)s;
+            if (uv.inst != null)
+                return isSubtypeUnchecked(t, uv.inst, warn);
+        }
         else if (!s.isRaw()) {
             Type t2 = asSuper(t, s.tsym);
             if (t2 != null && t2.isRaw()) {

test/tools/javac/generics/inference/6718364/T6718364.java

+/*
+ * 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 6718364
+ * @summary inference fails when a generic method is invoked with raw arguments
+ * @compile/ref=T6718364.out -XDstdout -XDrawDiagnostics -Xlint:unchecked T6718364.java
+ */
+class T6718364 {
+    class X<T> {}
+
+    public <T> void m(X<T> x, T t) {}
+
+    public void test() {
+        m(new X<X<Integer>>(), new X());
+    }
+}

test/tools/javac/generics/inference/6718364/T6718364.out

+T6718364.java:36:32: compiler.warn.prob.found.req: (- compiler.misc.unchecked.assign), T6718364.X, T6718364.X<java.lang.Integer>
+T6718364.java:36:10: compiler.warn.unchecked.meth.invocation.applied: <T>m(T6718364.X<T>,T), T6718364, , T6718364.X<T6718364.X<java.lang.Integer>>,T6718364.X
+2 warnings
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