Include more errors when computing complete list

pkg/analyzer/lib/task/model.dart

Index: pkg/analyzer/lib/task/model.dart
diff --git a/pkg/analyzer/lib/task/model.dart b/pkg/analyzer/lib/task/model.dart
index 15ff9fcadcd02df8e5e078a5feffcb008d5c1882..0a457661e8283f191e7ce78fd6e46a0ac4fd6bcf 100644
--- a/pkg/analyzer/lib/task/model.dart
+++ b/pkg/analyzer/lib/task/model.dart
@@ -437,6 +437,12 @@ abstract class TaskInput<V> {
    * Create and return a builder that can be used to build this task input.
    */
   TaskInputBuilder<V> createBuilder();
+
+  /**
+   * Return a task input that can be used to compute a list whose elements are
+   * the result of passing the result of this input to the [mapper] function.
+   */
+  ListTaskInput /*<E>*/ mappedToList(List /*<E>*/ mapper(V value));
 }
 
 /**