Creates `reflectors`, as a meta-meta feature that enables dynamic selection of a "mirror system".

reflectable/lib/reflectable.dart

Index: reflectable/lib/reflectable.dart
diff --git a/reflectable/lib/reflectable.dart b/reflectable/lib/reflectable.dart
index 5b8281293a5b07f386590ce1709bdea29817a48a..a48a6332398999014ac67d124423d0c5d6a5d499 100644
--- a/reflectable/lib/reflectable.dart
+++ b/reflectable/lib/reflectable.dart
@@ -90,7 +90,7 @@ abstract class ReflectableInterface {
 /// which means that the behavior of the instance can be expressed by
 /// generating code in the class.  Generalizations of this setup may
 /// be supported in the future if compelling use cases come up.
-class Reflectable extends implementation.ReflectableImpl
+abstract class Reflectable extends implementation.ReflectableImpl
     implements ReflectableInterface {
   // Intended to near-uniquely identify this class in target programs.
   static const thisClassName = reflectable_class_constants.name;
@@ -108,6 +108,8 @@ class Reflectable extends implementation.ReflectableImpl
 
   const Reflectable.fromList(List<ReflectCapability> capabilities)
       : super.fromList(capabilities);
+
+  static Set<Reflectable> get reflectors => implementation.reflectors;

[sigurdm, 2015/10/09 07:52:04]

I still think it would be better to give:

static Reflector getInstance(ClassMirror reflectorClass);

So people are not tempted to browse through the values.

[eernst, 2015/10/09 10:09:04]

Introduced a `getInstance` static method and adjusted the examples to use that
instead.

`reflectors` is no more available.

 }
 
 /// Returns true if the transformed version is running, false otherwise.