8003280: Add lambda tests

Turn on lambda expression, method reference and default method support

Reviewed-by: jjg

langtools/test/tools/javac/lambda/MostSpecific03.java

@@ -0,0 +1,63 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug 8003280
+ * @summary Add lambda tests
+ *  check correctness of structural most specific test routine
+ * @compile/fail/ref=MostSpecific03.out -XDrawDiagnostics MostSpecific03.java
+ */
+
+class Test {
+
+    interface IntMapper {
+        int map();
+    }
+
+    interface LongMapper {
+        long map();
+    }
+
+    void m(IntMapper... im) { }
+    void m(LongMapper... lm) { }
+
+    void m2(IntMapper im1, IntMapper... im) { }
+    void m2(LongMapper... lm) { }
+
+    void test1() {
+        m(); //ambiguous
+        m(()->1); //ok
+        m(()->1, ()->1); //ok
+        m(()->1, ()->1, ()->1); //ok
+    }
+
+    void test2() {
+        m(null, null); //ambiguous
+        m(()->1, null); //ambiguous
+        m(null, ()->1); //ambiguous
+        m(()->1L, null); //ok
+        m(null, ()->1L); //ok
+    }
+
+    void test3() {
+        m2(); //ok
+        m2(()->1); //ambiguous
+        m2(()->1, ()->1); //ok
+        m2(()->1, ()->1, ()->1); //ok
+    }
+
+    void test4() {
+        m2(null, null, null); //ambiguous
+        m2(()->1, null, null); //ambiguous
+        m2(null, ()->1, null); //ambiguous
+        m2(null, null, ()->1); //ambiguous
+        m2(()->1, ()->1, null); //ambiguous
+        m2(null, ()->1, ()->1); //ambiguous
+        m2(()->1, null, ()->1); //ambiguous
+
+        m2(()->1L, null, null); //ok
+        m2(null, ()->1L, null); //ok
+        m2(null, null, ()->1L); //ok
+        m2(()->1L, ()->1L, null); //ok
+        m2(null, ()->1L, ()->1L); //ok
+        m2(()->1L, null, ()->1L); //ok
+    }
+}