8056984: Exception in compiler: java.lang.AssertionError: isSubClass T

Summary: Must use type variable's captured bound as a method receiver, instead of the type variable itself, while checking if deferred attribution is needed.
Reviewed-by: mcimadamore, vromero

src/share/classes/com/sun/tools/javac/comp/DeferredAttr.java

@@ -1314,6 +1314,12 @@ public class DeferredAttr extends JCTree.Visitor {
                 site = env.enclClass.sym.type;
             }
 
+            while (site.hasTag(TYPEVAR)) {
+                site = site.getUpperBound();
+            }
+
+            site = types.capture(site);
+
             List<Type> args = rs.dummyArgs(tree.args.length());
             Name name = TreeInfo.name(tree.meth);
 

test/tools/javac/lambda/T8056984.java

+/*
+ * Copyright (c) 2014, 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 8056984
+ * @summary Ensure that method resolution runs over a captured type variables when checking if
+ *          deferred attribution is needed
+ * @compile T8056984.java
+ */
+class T8056984<T1 extends B&C, T2 extends T1> {
+    public T8056984(T1 t1, T2 t2) {
+        System.err.println(t1.hashCode());
+        System.err.println(t2.hashCode());
+    }
+}
+class B {
+}
+interface C {
+    public int hashCode();
+}