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1 // Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file | |
2 // for details. All rights reserved. Use of this source code is governed by a | |
3 // BSD-style license that can be found in the LICENSE file. | |
4 | |
5 /*@testedFeatures=inference*/ | |
6 library test; | |
7 | |
8 import 'dart:async'; | |
9 | |
10 class MyFuture<T> implements Future<T> { | |
11 MyFuture() {} | |
12 MyFuture.value(T x) {} | |
13 dynamic noSuchMethod(invocation); | |
14 MyFuture<S> then<S>(dynamic f(T x), {Function onError}) => null; | |
15 } | |
16 | |
17 void main() { | |
18 var /*@type=Future<double>*/ f = | |
19 foo().then(/*@returnType=double*/ (/*@type=dynamic*/ _) => 2.3); | |
20 Future<int> f2 = /*error:INVALID_ASSIGNMENT*/ /*@promotedType=none*/ f; | |
21 | |
22 // The unnecessary cast is to illustrate that we inferred <double> for | |
23 // the generic type args, even though we had a return type context. | |
24 Future<num> f3 = /*info:UNNECESSARY_CAST*/ foo().then( | |
25 /*@returnType=double*/ (/*@type=dynamic*/ _) => 2.3) as Future<double>; | |
26 } | |
27 | |
28 Future foo() => new Future<int>.value(1); | |
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