| // Copyright (c) 2017, 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. |
| // @dart=2.9 |
| /*@testedFeatures=inference*/ |
| library test; |
| |
| void block_test() { |
| List<Object> Function() g; |
| g = /*@ returnType=List<Object*>* */ () { |
| return /*@ typeArgs=Object* */ [3]; |
| }; |
| assert(g is List<Object> Function()); |
| assert(g is! List<int> Function()); |
| g(). /*@target=List.add*/ add("hello"); // No runtime error |
| List<int> l = /*@ typeArgs=int* */ [3]; |
| g = /*@ returnType=List<int*>* */ () { |
| return l; |
| }; |
| assert(g is List<Object> Function()); |
| assert(g is List<int> Function()); |
| try { |
| g(). /*@target=List.add*/ add("hello"); // runtime error |
| throw 'expected a runtime error'; |
| } on TypeError {} |
| Object o = l; |
| g = /*@ returnType=List<Object*>* */ () { |
| return o; |
| }; // No implicit downcast on the assignment, implicit downcast on the return |
| assert(g is List<Object> Function()); |
| assert(g is! List<int> Function()); |
| assert(g is! Object Function()); |
| g(); // No runtime error; |
| o = 3; |
| try { |
| g(); // Failed runtime cast on the return type of f |
| throw 'expected a runtime error'; |
| } on TypeError {} |
| } |
| |
| void arrow_test() { |
| List<Object> Function() g; |
| g = /*@ returnType=List<Object*>* */ () => /*@ typeArgs=Object* */ [3]; |
| assert(g is List<Object> Function()); |
| assert(g is! List<int> Function()); |
| g(). /*@target=List.add*/ add("hello"); // No runtime error |
| List<int> l = /*@ typeArgs=int* */ [3]; |
| g = /*@ returnType=List<int*>* */ () => l; |
| assert(g is List<Object> Function()); |
| assert(g is List<int> Function()); |
| try { |
| g(). /*@target=List.add*/ add("hello"); // runtime error |
| throw 'expected a runtime error'; |
| } on TypeError {} |
| Object o = l; |
| g = /*@ returnType=List<Object*>* */ () => |
| o; // No implicit downcast on the assignment, implicit downcast on the return |
| assert(g is List<Object> Function()); |
| assert(g is! List<int> Function()); |
| assert(g is! Object Function()); |
| g(); // No runtime error; |
| o = 3; |
| try { |
| g(); // Failed runtime cast on the return type of f |
| throw 'expected a runtime error'; |
| } on TypeError {} |
| } |
| |
| main() { |
| block_test(); |
| arrow_test(); |
| } |