Infer VariableSet types.

pkg/front_end/testcases/inference/assign_local.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;
+
+class A<T> {}
+
+class B<T> extends A<T> {}
+
+main() {
+  num x;
+  var /*@type=int*/ x1 = (x = 1);
+  var /*@type=double*/ x2 = (x = 1.0);
+
+  // TODO(scheglov) uncomment when constructor inference is implemented.
+//  A<int> y;
+//  var /*@type=A<int>*/ y1 = (y = /*@typeArgs=int*/ new A());
+//  var /*@type=B<int>*/ y2 = (y = /*@typeArgs=int*/ new B());
+}