8003280: Add lambda tests

Turn on lambda expression, method reference and default method support

Reviewed-by: jjg

langtools/test/tools/javac/lambda/LambdaConv21.java

@@ -0,0 +1,38 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug 8003280
+ * @summary Add lambda tests
+ *  check that code generation handles void-compatibility correctly
+ * @compile/fail/ref=LambdaConv21.out -XDrawDiagnostics LambdaConv21.java
+ */
+
+class LambdaConv21 {
+
+    interface SAM_void<X> {
+        void m();
+    }
+
+    interface SAM_java_lang_Void {
+        Void m();
+    }
+
+    static void m_void() { }
+
+    static Void m_java_lang_Void() { return null; }
+
+    static void testExpressionLambda() {
+        SAM_void s1 = ()->m_void(); //ok
+        SAM_java_lang_Void s2 = ()->m_void(); //no - incompatible target
+        SAM_void s3 = ()->m_java_lang_Void(); //no - incompatible target
+        SAM_java_lang_Void s4 = ()->m_java_lang_Void(); //ok
+    }
+
+    static void testStatementLambda() {
+        SAM_void s1 = ()-> { m_void(); }; //ok
+        SAM_java_lang_Void s2 = ()-> { m_void(); }; //no - missing return value
+        SAM_void s3 = ()-> { return m_java_lang_Void(); }; //no - unexpected return value
+        SAM_java_lang_Void s4 = ()-> { return m_java_lang_Void(); }; //ok
+        SAM_void s5 = ()-> { m_java_lang_Void(); }; //ok
+        SAM_java_lang_Void s6 = ()-> { m_java_lang_Void(); }; //no - missing return value
+    }
+}