/*
 * 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 Null check operator: If N is an expression of the form E!, then:
 *  Let before(E) = before(N)
 *  Let null(N) = unreachable(null(E))
 *  Let nonNull(N) = nonNull(E)
 * @description Checks reachability after Null check operator
 *
 * @author sgrekhov@unipro.ru
 * @issue 42021
 */
// Requirements=nnbd-strong
import "../../../Utils/expect.dart";

main () {
  late int i;
  var s = "" as String?;
  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
  }
}