Generated front_end/testcases/inference test files from Analyzer tests.

pkg/front_end/testcases/inference/future_then_downwards_method_target.dart

+// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/*@testedFeatures=inference*/
+library test;
+
+import 'dart:async';
+
+main() {
+  Future<int> f;
+  Future<List<int>>
+      b = /*info:ASSIGNMENT_CAST should be pass*/ /*@promotedType=none*/ f
+          .then(
+              /*@returnType=List<dynamic>*/ (/*@type=int*/ x) => /*@typeArgs=dynamic*/ [])
+          .whenComplete(/*@returnType=Null*/ () {});
+  b = /*@promotedType=none*/ f.then(
+      /*@returnType=List<int>*/ (/*@type=int*/ x) => /*@typeArgs=int*/ []);
+}