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3da1591253
Allow null to be cast as function types in weak mode. Change-Id: I42084250c428b7e6a18ce343305d43603b4e1ec4 Fixes: https://github.com/dart-lang/sdk/issues/41680 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/144995 Commit-Queue: Nicholas Shahan <nshahan@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com> Reviewed-by: Mark Zhou <markzipan@google.com>
27 lines
882 B
Dart
27 lines
882 B
Dart
// Copyright (c) 2020, 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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// Requirements=nnbd-strong
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import "package:expect/expect.dart";
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typedef dynamicToDynamic = dynamic Function(dynamic);
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typedef voidToT = T Function<T>();
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dynamic dynamicNull = null;
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cast<T>(dynamic value) => value as T;
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bool allowsArgument(T Function<T>() fn) => true;
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main() {
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// In strong mode Null is not a subtype of function types.
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Expect.throwsTypeError(() => dynamicNull as Function);
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Expect.throwsTypeError(() => dynamicNull as dynamicToDynamic);
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Expect.throwsTypeError(() => cast<dynamic Function(dynamic)>(dynamicNull));
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Expect.throwsTypeError(() => dynamicNull as voidToT);
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Expect.throwsTypeError(() => allowsArgument(dynamicNull));
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}
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