| // Copyright (c) 2018, 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 |
| |
| /// @assertion An expression of the form [e as T] is accepted as a potentially |
| /// and compile-time constant expression if [e] is potentially constant or |
| /// compile-time constant, respectively, and [T] is a compile-time constant type. |
| /// A compile-time constant type means any type that doesn't contain free type |
| /// variables, so the type expression always resolves to the exact same type. |
| /// @description Checks that an expression of the form [e as T] is not accepted |
| /// and causes compile time error if argument is a constant of incorrect type. |
| /// @author iarkh@unipro.ru |
| |
| class A { |
| const A(); |
| } |
| |
| class B { |
| const B(); |
| } |
| |
| class MyClass { |
| final A a; |
| const MyClass(Object o) : a = o as A; |
| } |
| |
| main() { |
| const MyClass c1 = MyClass("12345"); //# 01: compile-time error |
| const MyClass c2 = MyClass(12345); //# 02: compile-time error |
| const MyClass c3 = MyClass(B()); //# 03: compile-time error |
| const c4 = new List(); //# 04: compile-time error |
| } |