LanguageFeatures/nnbd/weak/boolean_conditional_evaluation_A03_t01.dart

/*
 * Copyright (c) 2021, 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.
 */
/**
 * @assertion With unsound null checking, evaluation proceeds as follows:
 *
 * First e is implicitly cast to bool if required (using
 * LEGACY_SUBTYPE(e.runtimeType, bool))
 * This cast may fail, and if so it is a TypeError.
 * If the cast does not fail, then the result may still be null, and so the
 * result must be checked against null.
 * If the null check fails, it is an AssertionError, otherwise evaluation of the
 * enclosing conditional proceeds as usual.
 *
 * @description Checks that it is a TypeError if runtime check fails
 *
 * @author sgrekhov@unipro.ru
 */
// Requirements=nnbd-weak
import "../../../Utils/expect.dart";

main() {
  dynamic d = 42;
  Expect.throws(() {
    if(d) {}
  }, (e) => e is TypeError);

  d = new Object();
  Expect.throws(() {
    if(d) {}
  }, (e) => e is TypeError);
}