Robert Nystrom
33798260d6
Change-Id: I781aabc6acc4f0341659380ed6cd169d66edce4e Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/425346 Commit-Queue: Lasse Nielsen <lrn@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Lasse Nielsen <lrn@google.com>
39 lines
1.0 KiB
Dart
39 lines
1.0 KiB
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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// Test that it is an error to await an expression of type `void`.
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import "dart:async";
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void v;
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List<void> vs = [null];
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FutureOr<void> fov;
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void main() async {
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await print('');
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// ^^^^^
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// [analyzer] COMPILE_TIME_ERROR.USE_OF_VOID_RESULT
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// [cfe] This expression has type 'void' and can't be used.
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await v;
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// ^
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// [analyzer] COMPILE_TIME_ERROR.USE_OF_VOID_RESULT
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// [cfe] This expression has type 'void' and can't be used.
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await vs[0];
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// ^^^^^
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// [analyzer] COMPILE_TIME_ERROR.USE_OF_VOID_RESULT
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// ^
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// [cfe] This expression has type 'void' and can't be used.
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var v2 = vs[0];
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await v2;
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// ^^
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// [analyzer] COMPILE_TIME_ERROR.USE_OF_VOID_RESULT
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// [cfe] This expression has type 'void' and can't be used.
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// A `FutureOr<void>` can be awaited.
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await fov;
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}
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