blob: 25f8936f0dcc3cb963ae52ec0eb7e5d73f11292c [file] [log] [blame]
// 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 least upper bound through type checking of conditionals.
import 'package:expect/expect.dart';
class Expect {
static isTrue(bool cond, String message) {
if (!cond) throw message;
class A {}
class B {}
class C extends B {}
class D extends B {}
class E<T> {}
class F<T> extends E<T> {}
void main() {
checkType(true ? A() : B())<Object>();
checkType(true ? B() : C())<B>();
checkType(true ? C() : D())<B>();
checkType(true ? E<B>() : E<C>())<E<B>>();
checkType(true ? E<B>() : F<C>())<E<B>>();
/// Tests that [A] (which should be inferred from the expression for [actual]
/// is the same as [E].
void Function<E>() checkType<A>(A actual) {
return <E>() {
Expect.isTrue(<E>[] is List<A> && <A>[] is List<E>,
"Argument expression should have inferred type '$E' but was '$A'.");