| /* |
| * Copyright (c) 2020, 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 We say that a variable x is promotable via assignment of an |
| * expression of type T given variable model VM if |
| * |
| * VM = VariableModel(declared, promoted, tested, assigned, unassigned, |
| * captured) |
| * and captured is false |
| * and S is the current type of x in VM |
| * and T <: S and not S <: T |
| * and T is a type of interest for x in tested |
| * |
| * @description Checks that if captured is true then promotion via assignment is |
| * not performed |
| * |
| * @author sgrekhov@unipro.ru |
| */ |
| |
| class S {} |
| class T extends S { |
| int foo() => 42; |
| } |
| |
| Function? f; |
| |
| main() { |
| S x = new S(); |
| void bar(var v) { |
| x = v; |
| } |
| f = bar; |
| if (x is T) { |
| // nothing |
| } |
| x = new T(); |
| x.foo(); |
| // ^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| } |
