pkg/front_end/testcases/runtime_checks/implicit_downcast_constructor_initializer.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=checks*/
library test;

class C {
  bool b;
  C(Object o) : b = o;
}

main() {
  Object o = 1;
  try {
    new C(o);
    throw 'no exception';
  } on TypeError {}
}