mirror of
https://github.com/dart-lang/sdk
synced 2024-09-16 00:09:49 +00:00
a2cc089472
Change-Id: Iff60de7b9fbe9371c71c098a9a36e43d2dc7f134 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/151810 Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Nicholas Shahan <nshahan@google.com> Commit-Queue: Bob Nystrom <rnystrom@google.com>
94 lines
1.2 KiB
Dart
94 lines
1.2 KiB
Dart
// TODO(multitest): This was automatically migrated from a multitest and may
|
|
// contain strange or dead code.
|
|
|
|
// 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.
|
|
|
|
}
|
|
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.
|
|
|
|
|
|
x = d1.e;
|
|
}
|
|
|
|
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>
|
|
|
|
|
|
}
|
|
}
|