7196163: Project Coin: Allow effectively final variables to be used as resources in try-with-resources

Allowing final variables as operands to try-with-resources; also reviewed by Sergei Pikalev.

Reviewed-by: darcy, mcimadamore, vromero

langtools/test/tools/javac/diags/examples/VarInTryWithResourcesNotSupportedInSource.java

@@ -0,0 +1,41 @@
+/*
+ * 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.
+ */
+
+// key: compiler.err.var.in.try.with.resources.not.supported.in.source
+// key: compiler.warn.source.no.bootclasspath
+// options: -source 8
+
+class VarInTryWithResourcesNotSupportedInSource {
+    void m() {
+        AutoCloseable ac = new CloseableImpl();
+
+        try (ac) {
+        }
+    }
+}
+
+class CloseableImpl implements AutoCloseable {
+    @Override
+    public void close() throws Exception {
+    }
+}