Johnni Winther
236f3f820d
The handling of null shorting in the variable initializer interfered with the declaration of the variable, making subsequent flow potentially losing track of promotions. Closes #42504 Change-Id: Idb17920ffe8746983825714f76160abcca54751b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/152760 Reviewed-by: Jens Johansen <jensj@google.com> Commit-Queue: Johnni Winther <johnniwinther@google.com>
37 lines
855 B
Dart
37 lines
855 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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abstract class ImageStreamCompleter {
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void addListener();
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}
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class _LiveImage {
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factory _LiveImage(ImageStreamCompleter a) => throw UnimplementedError();
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}
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abstract class Foo {
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dynamic get _pendingImages;
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ImageStreamCompleter? putIfAbsent(Object key, ImageStreamCompleter loader()) {
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assert(key != null);
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assert(loader != null);
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ImageStreamCompleter? result = _pendingImages[key]?.completer;
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if (result != null) {
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return result;
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}
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try {
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result = loader();
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_LiveImage(result);
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} catch (error) {
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return null;
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}
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result.addListener();
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return result;
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}
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}
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main() {}
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