LanguageFeatures/nnbd/flow-analysis/reachability_continue_A04_t01.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 Continue statement: If N is a statement of the form continue [L];
 * then:
 *
 *  Let S be the statement targeted by the continue. If L is not present, this
 *  is the innermost do, for, or while statement. Otherwise it is the do, for,
 *  or while statement with a label matching L, or the switch statement
 *  containing a switch case with a label matching L.
 *
 *  Update continue(S) = join(continue(S), before(N)).
 *
 *  Let after(N) = unreachable(before(N)).
 *
 * @description Checks reachability after continue statement. Test `switch`
 * statement
 *
 * @author sgrekhov@unipro.ru
 */
// Requirements=nnbd-strong
import "../../../Utils/expect.dart";

main() {
  late int i;
  int j = 42;
  switch (j) {
    case 42:
      continue test;
      i = 42; // Variable is initialized in a dead code
    test:
    case 43:
  }
  try {
    // 'i' is treated here by flow analysis as possibly assigned, so it is a
    // runtime (not compile time) error to read it
    i;
    Expect.fail("Error expected");
  } on Error {
    // Ok, expected
  }
}