LanguageFeatures/nnbd/flow-analysis/reachability_A01_t02.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 getter of
 * type Never
 *
 * @author sgrekhov@unipro.ru
 */

Never get n => throw "Lily was here";

main() {
  try {
    late int i;
    bool b = (() => true)();
    if (b) {
      n;        // The code after this point is unreachable
      i = 42;   // Variable is initialized in a dead code. This leaves it definitely unassigned
    }
    i; // It is an error to read a local late variable when it is definitely unassigned.
//^
// [analyzer] unspecified
// [cfe] unspecified
  } catch (_) {}
}