Big merge from experimental to bleeding edge.

sdk/lib/_internal/compiler/implementation/mirrors/mirrors.dart

Index: sdk/lib/_internal/compiler/implementation/mirrors/mirrors.dart
diff --git a/sdk/lib/_internal/compiler/implementation/mirrors/mirrors.dart b/sdk/lib/_internal/compiler/implementation/mirrors/mirrors.dart
index 19e5cc09234971356025c318de9f55dbe2401d0b..34bccc2f88f7180ba0a4f063afc84fbee86a11bb 100644
--- a/sdk/lib/_internal/compiler/implementation/mirrors/mirrors.dart
+++ b/sdk/lib/_internal/compiler/implementation/mirrors/mirrors.dart
@@ -4,6 +4,7 @@
 
 library mirrors;
 
+import 'dart:async';
 import 'dart:io';
 import 'dart:uri';
 
@@ -194,9 +195,9 @@ abstract class InstanceMirror implements ObjectMirror {
 /**
  * Specialized [InstanceMirror] used for reflection on constant lists.
  */
-abstract class ListInstanceMirror
-    implements InstanceMirror, Sequence<Future<InstanceMirror>> {
-
+abstract class ListInstanceMirror implements InstanceMirror {
+  Future<InstanceMirror> operator[](int index);
+  int get length;
 }
 
 /**
@@ -717,4 +718,4 @@ class DartdocComment {
   final String text;
 
   const DartdocComment(this.text);
-}
+}