Clarifies the status of implicit accessors; fixed several related bugs.

test_reflectable/test/parameter_test.dart

Index: test_reflectable/test/parameter_test.dart
diff --git a/test_reflectable/test/parameter_test.dart b/test_reflectable/test/parameter_test.dart
index c37120ef30fb30b26567ba6c2b80e7d141f7bb89..32af1eb7c7f66299c4ead764d4b462b63a6fa7d6 100644
--- a/test_reflectable/test/parameter_test.dart
+++ b/test_reflectable/test/parameter_test.dart
@@ -11,6 +11,9 @@ library test_reflectable.test.parameter_test;
 import 'package:reflectable/reflectable.dart';
 import 'package:unittest/unittest.dart';
 
+// TODO(eernst) implement: Avoid testing the same things twice in this test and
+// in 'parameter_mirrors_test.dart'.
+
 class MyReflectable extends Reflectable {
   const MyReflectable()
       : super(typeCapability, invokingCapability, declarationsCapability);