8003280: Add lambda tests

Turn on lambda expression, method reference and default method support

Reviewed-by: jjg

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

@@ -0,0 +1,26 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug 8003280
+ * @summary Add lambda tests
+ *  check that that void compatibility affects overloading as expected
+ * @compile/fail/ref=VoidCompatibility.out -XDrawDiagnostics VoidCompatibility.java
+ */
+class VoidCompatibility {
+
+    interface Runnable { void run(); } //1
+    interface Thunk<T> { T get(); } //2
+
+    void schedule(Runnable r) { }
+    void schedule(Thunk<?> t) { }
+
+    void test() {
+        schedule(() -> System.setProperty("done", "true")); //2
+        schedule(() -> { System.setProperty("done", "true"); }); //1
+        schedule(() -> { return System.setProperty("done", "true"); }); //2
+        schedule(() -> System.out.println("done")); //1
+        schedule(() -> { System.out.println("done"); }); //1
+        schedule(Thread::yield); //1
+        schedule(Thread::getAllStackTraces); //ambiguous
+        schedule(Thread::interrupted); //1 (most specific)
+    }
+}