Paul Berry
e933e91aaa
This is a reland of 6a1c54ec30
Original change's description:
> Flow analysis: promote to non-nullable on initialization
>
> When flow analysis encounters a variable declaration of the form `T? x
> = expr;`, if the type of `expr` is `T`, then the variable is
> immediately promoted to type `T`.
>
> Fixes #43099.
>
> Change-Id: Ia206fe0d50e2fdd9bdf637e13c85633d8490dbcc
> Bug: https://github.com/dart-lang/sdk/issues/43099
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/163841
> Commit-Queue: Paul Berry <paulberry@google.com>
> Reviewed-by: Bob Nystrom <rnystrom@google.com>
> Reviewed-by: Johnni Winther <johnniwinther@google.com>
> Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Bug: https://github.com/dart-lang/sdk/issues/43099
Change-Id: I7530bb0f7c24674a7b500558b89d50b35e045aca
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/166305
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Commit-Queue: Paul Berry <paulberry@google.com>
28 lines
937 B
Dart
28 lines
937 B
Dart
// Copyright (c) 2019, 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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// Tests syntax edge cases.
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import 'package:expect/expect.dart';
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void main() {
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// Trailing comma.
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Expect.listEquals([1, 2], [...[1, 2],]);
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Expect.mapEquals({1: 1, 2: 2}, {...{1: 1, 2: 2},});
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Expect.setEquals({1, 2}, {...{1, 2},});
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// Precedence.
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Expect.listEquals([1, 2, 3], [1, ...true ? [2] : [], 3]);
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Expect.listEquals([1, 3], [1, ...?true ? null : [], 3]);
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var a = [0];
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Expect.listEquals([1, 2, 3], [1, ...a = [2], 3]);
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var nullableA = [0] as List<int>?;
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Expect.listEquals([1, 3], [1, ...?nullableA = null, 3]);
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var b = [2];
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Expect.listEquals([1, 2, 3, 4], [1, ...b..add(3), 4]);
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var nullableB = [2] as List<int>?;
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Expect.listEquals([1, 2, 3, 4], [1, ...?nullableB?..add(3), 4]);
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}
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