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05ca544f15
Change-Id: Iaa0ca2b4f2d1b15f79ddca37834d3ed2497bc068 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/149242 Commit-Queue: Joshua Litt <joshualitt@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com>
45 lines
1.2 KiB
Dart
45 lines
1.2 KiB
Dart
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// @dart = 2.7
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import "package:expect/expect.dart";
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main() {
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var a = new A();
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Expect.equals(42, a.foo(42));
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var b = new B();
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Expect.equals(42 - 87, b.foo(42));
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// Make sure we do not try to track the parameter type of the
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// argument passed to test.
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Expect.equals("is !A", test(0));
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Expect.equals("is !A", test("fisk"));
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// Passing b to test should lead to an exception because the string
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// we end up passing to B.foo does not implement the - operator.
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Expect.throws(() => test(b), (e) => e is NoSuchMethodError);
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}
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// TODO(kasperl): Make sure this does not get inlined.
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test(x) {
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if (x is A) {
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// The selector we use for this call site has the receiver type A
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// because of data flow analysis. We have to make sure that we
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// realize that this does not rule out calling B.foo because B
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// implements A.
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return x.foo("hest");
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} else {
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return "is !A";
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}
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}
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class A {
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foo(var x) => x;
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}
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class B implements A {
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foo(var x) => x - 87;
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}
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