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Side by Side Diff: pkg/front_end/testcases/inference/future_then_conditional_deprecated_2.dart

Issue 2859703004: Re-remove ad hoc Future.then inference. (Closed)
Patch Set: rebase Created 3 years, 7 months ago
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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 MyFuture<bool> f;
19 Future<int> t1 = /*@promotedType=none*/ f.then(
20 /*@returnType=Future<int>*/ (/*@type=bool*/ x) async =>
21 x ? 2 : await new MyFuture<int>.value(3));
22 Future<int> t2 = /*@promotedType=none*/ f
23 .then(/*@returnType=Future<int>*/ (/*@type=bool*/ x) async {
24 return /*info:DOWN_CAST_COMPOSITE*/ await x
25 ? 2
26 : new MyFuture<int>.value(3);
27 });
28 Future<int> t5 = /*@promotedType=none*/ f.then(
29 /*@returnType=Object*/ (/*@type=bool*/ x) =>
30 x ? 2 : new MyFuture<int>.value(3));
31 Future<int> t6 = /*@promotedType=none*/ f.then(
32 /*@returnType=FutureOr<int>*/ (/*@type=bool*/ x) {
33 return /*info:DOWN_CAST_COMPOSITE*/ x ? 2 : new MyFuture<int>.value(3);
34 });
35 }
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