8008813: Structural most specific fails when method reference is passed to overloaded method

Bad logic for checking most specific method reference type

Reviewed-by: jjg

langtools/src/share/classes/com/sun/tools/javac/comp/Resolve.java

@@ -984,7 +984,7 @@ public class Resolve {
                                 Type ret_t = desc_t.getReturnType();
                                 Type ret_s = desc_s.getReturnType();
                                 result &= ((tree.refPolyKind == PolyKind.STANDALONE)
-                                        ? standaloneMostSpecific(ret_t, ret_s, tree.type, warn)
+                                        ? standaloneMostSpecific(ret_t, ret_s, tree.sym.type.getReturnType(), warn)
                                         : polyMostSpecific(ret_t, ret_s, warn));
                             } else {
                                 return;

langtools/test/tools/javac/lambda/MostSpecific08.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8008813
+ * @summary Structural most specific fails when method reference is passed to overloaded method
+ * @compile MostSpecific08.java
+ */
+class MostSpecific08 {
+
+    static class C {
+        int getInt() { return -1; }
+        Integer getInteger() { return -1; }
+    }
+
+    interface IntResult { }
+    interface ReferenceResult<X> { }
+
+    interface PrimitiveFunction {
+        int f(C c);
+    }
+
+    interface ReferenceFunction<X> {
+        X f(C c);
+    }
+
+    interface Tester {
+        IntResult apply(PrimitiveFunction p);
+        <Z> ReferenceResult<Z> apply(ReferenceFunction<Z> p);
+    }
+
+    void testMref(Tester t) {
+        IntResult pr = t.apply(C::getInt);
+        ReferenceResult<Integer> rr = t.apply(C::getInteger);
+    }
+
+    void testLambda(Tester t) {
+        IntResult pr = t.apply(c->c.getInt());
+        ReferenceResult<Integer> rr = t.apply(c->c.getInteger());
+    }
+}