8003280: Add lambda tests

Turn on lambda expression, method reference and default method support

Reviewed-by: jjg

langtools/test/tools/javac/lambda/MostSpecific07.java

@@ -0,0 +1,31 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug 8003280
+ * @summary Add lambda tests
+ *  speculative cache contents are overwritten by deferred type-checking of nested stuck expressions
+ * @compile/fail/ref=MostSpecific07.out -XDrawDiagnostics MostSpecific07.java
+ */
+import java.util.*;
+
+class MostSpecific07 {
+
+    interface Predicate<X, Y> {
+        Y accept(X x);
+    }
+
+    interface VoidMapper {
+        void accept();
+    }
+
+    interface ExtPredicate<X, Y> extends Predicate<X, Y> { }
+
+    void test(boolean cond, ArrayList<String> als, VoidMapper vm) {
+        m(u -> ()->{}, als, als, vm);
+        m((u -> ()->{}), als, als, vm);
+        m(cond ? u -> ()->{} : u -> ()->{}, als, als, vm);
+    }
+
+    <U, V> U m(Predicate<U, V> p, List<U> lu, ArrayList<U> au, V v) { return null; }
+
+    <U, V> U m(ExtPredicate<U, V> ep, ArrayList<U> au, List<U> lu, V v) { return null; }
+}