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

pkg/front_end/testcases/inference/future_then_upwards_from_block.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> base;
+  var /*@type=Future<bool>*/ f = /*@promotedType=none*/ base
+      .then(/*@returnType=bool*/ (/*@type=int*/ x) {
+    return x == 0;
+  });
+  var /*@type=Future<bool>*/ g = /*@promotedType=none*/ base
+      .then(/*@returnType=bool*/ (/*@type=int*/ x) => x == 0);
+  Future<bool> b = /*@promotedType=none*/ f;
+  b = /*@promotedType=none*/ g;
+}