8003280: Add lambda tests

Turn on lambda expression, method reference and default method support

Reviewed-by: jjg

langtools/test/tools/javac/lambda/BadConv03.java

@@ -0,0 +1,20 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug 8003280
+ * @summary Add lambda tests
+ *  NPE while checking if subinterface is a SAM type
+ * @compile/fail/ref=BadConv03.out -XDrawDiagnostics BadConv03.java
+ */
+
+class BadConv03 {
+
+    interface A {
+        void a();
+    }
+
+    interface B extends A { //not a SAM (2 non-override equivalent abstracts!)
+        void a(int i);
+    }
+
+    B b = ()-> { };
+}