LanguageFeatures/nnbd/flow-analysis/reachability_A01_t08.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.

/**
 * @assertion Variable or getter: If N is an expression of the form x where the
 * type of x is T then:
 *
 * If T <: Never then:
 *  Let null(N) = unreachable(before(N)).
 *  Let notNull(N) = unreachable(before(N)).
 * Otherwise if T <: Null then:
 *  Let null(N) = before(N).
 *  Let notNull(N) = unreachable(before(N)).
 * Otherwise if T is non-nullable then:
 *  Let null(N) = unreachable(before(N)).
 *  Let notNull(N) = before(N).
 *
 * @description Checks reachability after variable or getter. Test non-nullable
 * type
 *
 * @author sgrekhov@unipro.ru
 * @issue 41981
 */
// Requirements=nnbd-strong
import "../../../Utils/expect.dart";

main() {
  late int i;
  String s = "";
  if (s == null) {
    i = 42; // `i` is not definitely unassigned because in a weak mode the
            // condition may be true
  }
  try {
    i;
    Expect.fail("Error expected");
  } on Error catch(e) {
    // Ok
  }
}