| // TODO(multitest): This was automatically migrated from a multitest and may |
| // contain strange or dead code. |
| |
| // @dart = 2.9 |
| |
| // Copyright (c) 2013, 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. |
| |
| // Test use of more specific in type promotion of interface types. |
| |
| class A { |
| var a; |
| } |
| |
| class B extends A { |
| var b; |
| } |
| |
| class C { |
| var c; |
| } |
| |
| class D<T> { |
| T d; |
| |
| D(this.d); |
| } |
| |
| class E<T> extends D<T> { |
| T e; |
| |
| E(e) |
| : this.e = e, |
| super(e); |
| } |
| |
| void main() { |
| testInterface(); |
| testGeneric(); |
| } |
| |
| void testInterface() { |
| var x; |
| var y; |
| |
| A a = new B(); |
| if (a is B) { |
| // Promotion B << A. |
| x = a.b; |
| } |
| if (a is C) { |
| // No promotion C !<< A. |
| |
| } |
| B b = new B(); |
| if (b is A) { |
| // No promotion B !<< A. |
| |
| } |
| if (x is A) { |
| // Promotion A << dynamic. |
| |
| } |
| } |
| |
| testGeneric() { |
| var x; |
| var y; |
| |
| D d1 = new E<B>(null); |
| if (d1 is E) { |
| // Promotion: E << D. |
| |
| } |
| if (d1 is E<A>) { |
| // Promotion: E<A> << D. |
| |
| |
| |
| } |
| |
| D<A> d2 = new E<B>(null); |
| if (d2 is E) { |
| // No promotion: E !<< D<A> |
| |
| } |
| |
| D<A> d3 = new E<B>(new B()); |
| if (d3 is E<B>) { |
| // Promotion: E<B> << D<A> |
| |
| |
| } |
| } |