| // 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 |
| |
| // Test that if the type of a parameter of a generic method is a type parameter, |
| // the type of the passed argument is checked (01) at compile time |
| // if the receiver is given via an interface-type variable, and (02) at runtime |
| // if the receiver is dynamic. |
| |
| library generic_methods_dynamic_test; |
| |
| import "package:expect/expect.dart"; |
| |
| class A {} |
| |
| class B {} |
| |
| class C { |
| T foo<T>(T t) => t; |
| List<T> bar<T>(Iterable<T> t) => <T>[t.first]; |
| } |
| |
| main() { |
| B b = new B(); |
| C c = new C(); |
| dynamic obj = c; |
| |
| c.foo<A>(b); //# 01: compile-time error |
| obj.foo<A>(b); //# 02: runtime error |
| |
| c.bar<A>(<B>[new B()]); //# 03: compile-time error |
| obj.bar<A>(<B>[new B()]); //# 04: runtime error |
| |
| Expect.equals(c.foo<B>(b), b); //# 05: ok |
| Expect.equals(obj.foo<B>(b), b); //# 05: continued |
| |
| dynamic x = c.bar<B>(<B>[new B()]); //# 05: continued |
| Expect.isTrue(x is List<B>); //# 05: continued |
| Expect.equals(x.length, 1); //# 05: continued |
| |
| dynamic y = obj.bar<B>(<B>[new B()]); //# 05: continued |
| Expect.isTrue(y is List<B>); //# 05: continued |
| Expect.equals(y.length, 1); //# 05: continued |
| } |