Attempt to fix the build

pkg/analyzer/lib/src/task/inputs.dart

Index: pkg/analyzer/lib/src/task/inputs.dart
diff --git a/pkg/analyzer/lib/src/task/inputs.dart b/pkg/analyzer/lib/src/task/inputs.dart
index 8f8c56c5e3cd78c35bd441bba7c77d8edabce95e..308b06a5f2082c92ecee97b28f55f93ebe1810ea 100644
--- a/pkg/analyzer/lib/src/task/inputs.dart
+++ b/pkg/analyzer/lib/src/task/inputs.dart
@@ -301,7 +301,7 @@ class MapToFlattenListTaskInputBuilder<K, V, E>
  * An input to an [AnalysisTask] that is computed by mapping the value of
  * another task input to a list of values.
  */
-class ObjectToListTaskInput<E> extends TaskInputImpl with ListTaskInputMixin<E>
+class ObjectToListTaskInput<E> extends TaskInputImpl<List<E>> with ListTaskInputMixin<E>
     implements ListTaskInput<E> {
   /**
    * The input used to compute the value to be mapped.
@@ -333,7 +333,7 @@ class ObjectToListTaskInput<E> extends TaskInputImpl with ListTaskInputMixin<E>
   MapTaskInput<AnalysisTarget, dynamic /*V*/ > toMapOf(
       ResultDescriptor /*<V>*/ valueResult) {
     return new ListToMapTaskInput<AnalysisTarget, dynamic /*V*/ >(
-        this, valueResult.of);
+        this as dynamic, valueResult.of);
   }
 }