pkg/front_end/testcases/general/promoted_null_aware_access.dart

// Copyright (c) 2020, 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
method<T>(T o) {
  if (o is String) {
    o?.length;
  }
}

main() {
  method("");
}