Robert Nystrom
fc1b1ecc71
Change-Id: Idbcc965a27e9ffeedf5e0a1068b019de4193070f Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/127745 Commit-Queue: Bob Nystrom <rnystrom@google.com> Reviewed-by: Alexander Thomas <athom@google.com>
66 lines
1.5 KiB
Dart
66 lines
1.5 KiB
Dart
// TODO(multitest): This was automatically migrated from a multitest and may
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// contain strange or dead code.
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// Copyright (c) 2015, 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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// Verify semantics of the ?. operator when it is used to invoke a method.
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import "package:expect/expect.dart";
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import "conditional_access_helper.dart" as h;
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bad() {
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Expect.fail('Should not be executed');
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}
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class B {}
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class C extends B {
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f(callback()) => callback();
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int g(int callback()) => callback();
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static staticF(callback()) => callback();
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static int staticG(int callback()) => callback();
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}
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C nullC() => null;
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main() {
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// Make sure the "none" test fails if method invocation using "?." is not
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// implemented. This makes status files easier to maintain.
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nullC()?.f(null);
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// o?.m(...) is equivalent to ((x) => x == null ? null : x.m(...))(o).
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// C?.m(...) is equivalent to C.m(...).
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// The static type of o?.m(...) is the same as the static type of
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// o.m(...).
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{ int i = C?.staticG(() => 1); Expect.equals(1, i); }
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// Let T be the static type of o and let y be a fresh variable of type T.
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// Exactly the same static warnings that would be caused by y.m(...) are also
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// generated in the case of o?.m(...).
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// '?.' can't be used to access toplevel functions in libraries imported via
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// prefix.
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// Nor can it be used to access the toString method on the class Type.
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}
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