Handle assignability for Send and SendSet

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

Index: sdk/lib/_internal/compiler/implementation/dart_types.dart
diff --git a/sdk/lib/_internal/compiler/implementation/dart_types.dart b/sdk/lib/_internal/compiler/implementation/dart_types.dart
index 6f76fe64a4428268717040a82b7c05940215522f..6f0a248577d7e4ae1a6ae5f94ea93b4f17f7ece5 100644
--- a/sdk/lib/_internal/compiler/implementation/dart_types.dart
+++ b/sdk/lib/_internal/compiler/implementation/dart_types.dart
@@ -509,7 +509,9 @@ class InterfaceType extends GenericType {
     ClassElement classElement = element;
     InterfaceType receiver = this;
     InterfaceType declarer = receiver;
-    Element member = classElement.lookupLocalMember(name);
+    // TODO(johnniwinther): Lookup and callers should handle private members and
+    // injected members.
+    Element member = classElement.implementation.lookupLocalMember(name);
     if (member != null) {
       return createMember(receiver, declarer, member);
     }
@@ -521,7 +523,7 @@ class InterfaceType extends GenericType {
       if (supertype.element.isMixinApplication) continue;
       declarer = supertype;
       ClassElement lookupTarget = declarer.element;
-      member = lookupTarget.lookupLocalMember(name);
+      member = lookupTarget.implementation.lookupLocalMember(name);
       if (member != null) {
         return createMember(receiver, declarer, member);
       }