pkg/front_end/testcases/inference/bug30620_d.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.
// @dart=2.9
/*@testedFeatures=inference*/
library test;

String foo(obj) => obj is String
    ? /*@ promotedType=String* */ obj
        . /*@target=String.toUpperCase*/ toUpperCase()
    : null;

main() {}