pkg/front_end/testcases/runtime_checks/implicit_downcast_assert_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 {
  C(Object o) : assert(o);
}

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