| /* |
| * 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. |
| * ... |
| * Evaluating the initializer expression may validly cause a write to the field |
| * or variable, assuming that the field or variable is not final. In this case, |
| * the variable assumes the written value. The final value of the initializer |
| * expression overwrites any intermediate written values. |
| * |
| * @description Check that it is a runtime error if initializing expression |
| * writes an intermediate value to final field or variable |
| * @author sgrekhov@unipro.ru |
| * @issue 39802 |
| */ |
| // SharedOptions=--enable-experiment=non-nullable |
| // Requirements=nnbd-strong |
| import "../../Utils/expect.dart"; |
| |
| class C { |
| static late final String s; |
| late final String v; |
| } |
| |
| late final String g; |
| |
| main() { |
| late final String l; |
| |
| C.s = "Lily was here"; |
| Expect.equals("Lily was here", C.s); |
| Expect.throws(() {C.s = "Show must go on";}, |
| (e) => e is LateInitializationError); |
| Expect.equals("Lily was here", C.s); |
| |
| C c = new C(); |
| c.v = "Lily was here"; |
| Expect.equals("Lily was here", c.v); |
| Expect.throws(() {c.v = "Show must go on";}, |
| (e) => e is LateInitializationError); |
| Expect.equals("Lily was here", c.v); |
| |
| g = "Lily was here"; |
| Expect.equals("Lily was here", g); |
| Expect.throws(() {g = "Show must go on";}, |
| (e) => e is LateInitializationError); |
| Expect.equals("Lily was here", g); |
| |
| l = "Lily was here"; |
| Expect.equals("Lily was here", l); |
| Expect.throws(() {l = "Show must go on";}, |
| (e) => e is LateInitializationError); |
| Expect.equals("Lily was here", l); |
| } |