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

test_reflectable/test/parameter_test.dart

 // Copyright (c) 2015, the Dart Team. All rights reserved. Use of this
 // source code is governed by a BSD-style license that can be found in
 // the LICENSE file.
 
 // File being transformed by the reflectable transformer.
 // Accesses method parameters and their properties, such as
 // existence, being optional, type annotations.
 
 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);
 }
 
 const myReflectable = const MyReflectable();
 
 @myReflectable
 class MyClass {
   int arg0() => null;
@@ skipping 136 matching lines @@
     expect(namedArgumentsParameter0.type.reflectedType, String);
     expect(namedArgumentsParameter1.isOptional, false);
     expect(namedArgumentsParameter1.type.reflectedType, List);
     expect(namedArgumentsParameter2.isOptional, true);
     expect(namedArgumentsParameter2.isNamed, true);
     expect(namedArgumentsParameter2.type.reflectedType, String);
     expect(namedArgumentsParameter2.hasDefaultValue, true);
     expect(namedArgumentsParameter2.defaultValue, "42");
   });
 }