LanguageFeatures/nnbd/late_A02_t01.dart

/*
 * Copyright (c) 2019, 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 A read of a field or variable which is marked as late which has
 * not yet been written to causes the initializer expression of the variable to
 * be evaluated to a value, assigned to the variable or field, and returned as
 * the value of the read.
 *
 * If there is no initializer expression, the read causes a runtime error to be
 * thrown which is an instance of LateInitializationError
 *
 * @description Check that it is a runtime error to read late variable without
 * initializer expression
 * @author sgrekhov@unipro.ru
 * @issue 39801
 */
// SharedOptions=--enable-experiment=non-nullable
// Requirements=nnbd-strong
import "../../Utils/expect.dart";

class C {
  static late final String s1;
  static late String s2;
  covariant late String v1;
  late final String v2;
  late String v3;
}

late final String g1;
late String g2;

main() {
  late final String l1;
  late String l2;

  Expect.throws(() {C.s1;}, (e) => e is LateInitializationError);
  Expect.throws(() {C.s2;}, (e) => e is LateInitializationError);
  C c = new C();
  Expect.throws(() {c.v1;}, (e) => e is LateInitializationError);
  Expect.throws(() {c.v2;}, (e) => e is LateInitializationError);
  Expect.throws(() {c.v3;}, (e) => e is LateInitializationError);

  Expect.throws(() {g1;}, (e) => e is LateInitializationError);
  Expect.throws(() {g2;}, (e) => e is LateInitializationError);
  Expect.throws(() {l1;}, (e) => e is LateInitializationError);
  Expect.throws(() {l2;}, (e) => e is LateInitializationError);
}