7177385: Add attribution support for lambda expressions

Add support for function descriptor lookup, functional interface inference and lambda expression type-checking

Reviewed-by: jjg, dlsmith

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

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2012, 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.types.incompatible.diff.ret
+// key: compiler.err.prob.found.req
+// key: compiler.misc.incompatible.descs.in.functional.intf
+// key: compiler.misc.descriptor
+// key: compiler.misc.descriptor.throws
+// options: -XDallowLambda
+
+class IncompatibleDescsInFunctionalIntf {
+    interface A {
+        Integer m(String i) throws Exception;
+    }
+
+    interface B {
+        String m(String i);
+    }
+
+    interface SAM extends A,B { }
+
+    SAM s = x-> { };
+}