| /* |
| * 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 In an unmigrated library, override checking is done using legacy |
| * types. This means that an unmigrated library can bring together otherwise |
| * incompatible methods. When choosing the most specific signature during |
| * interface computation, all nullability and requiredness annotations are |
| * ignored, and the [Never] type is treated as [Null]. |
| * |
| * @description Check that if legacy class extends opted-in class, legacy field |
| * can accept null values if corresponding parent field is of both nullable or |
| * non-nullable type. |
| * |
| * @author iarkh@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=non-nullable |
| // @dart=2.4 |
| |
| import "../../Utils/expect.dart"; |
| import "override_checking_opted_in_lib.dart"; |
| |
| class A1 implements A { |
| String field1 = "c"; |
| String field2 = "d"; |
| |
| void test_nullable(int i) {} |
| void test_required({int i = 1}) {} |
| void test_never(Null i) {} |
| int test_return_nullable() => 1; |
| Null test_return_never() => null; |
| String get get_field1 => field1; |
| String get get_field2 => field1; |
| void set set_field1(String str) { field1 = str; } |
| void set set_field2(String str) { field2 = str; } |
| } |
| |
| class A2 implements A { |
| String field1 = null; |
| String field2 = null; |
| |
| void test_nullable(int i) {} |
| void test_required({int i = 1}) {} |
| void test_never(Null i) {} |
| int test_return_nullable() => 1; |
| Null test_return_never() => null; |
| String get get_field1 => field1; |
| String get get_field2 => field1; |
| void set set_field1(String str) { field1 = str; } |
| void set set_field2(String str) { field2 = str; } |
| } |
| |
| class A3 implements A { |
| String field1; |
| String field2; |
| |
| void test_nullable(int i) {} |
| void test_required({int i = 1}) {} |
| void test_never(Null i) {} |
| int test_return_nullable() => 1; |
| Null test_return_never() => null; |
| String get get_field1 => field1; |
| String get get_field2 => field1; |
| void set set_field1(String str) { field1 = str; } |
| void set set_field2(String str) { field2 = str; } |
| } |
| |
| main() { |
| A1 a1 = A1(); |
| a1.field1 = null; |
| Expect.isNull(a1.field1); |
| a1.field2 = null; |
| Expect.isNull(a1.field2); |
| |
| A2 a2 = A2(); |
| Expect.isNull(a2.field1); |
| Expect.isNull(a2.field2); |
| |
| A3 a3 = A3(); |
| Expect.isNull(a3.field1); |
| Expect.isNull(a3.field2); |
| } |