experimental meta anno matching syntax test case

tests/features1611/metamatching/Code.java

@@ -0,0 +1,19 @@
+import java.lang.annotation.*;
+
+@Retention(RetentionPolicy.RUNTIME)
+@interface Meta {}
+
+@Retention(RetentionPolicy.RUNTIME)
+@Meta
+@interface Foo {}
+
+public class Code {
+
+  @Foo
+  public void m() {}
+}
+aspect X {
+  before(): execution(@@Meta * *(..)) {
+  }
+}
+