tests/language/spread_collections/syntax_test.dart

// Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

// Tests syntax edge cases.
import 'package:expect/expect.dart';

void main() {
  // Trailing comma.
  Expect.listEquals(
    [1, 2],
    [
      ...[1, 2],
    ],
  );
  Expect.mapEquals(
    {1: 1, 2: 2},
    {
      ...{1: 1, 2: 2},
    },
  );
  Expect.setEquals(
    {1, 2},
    {
      ...{1, 2},
    },
  );

  // Precedence.
  Expect.listEquals(
    [1, 2, 3],
    [
      1,
      ...true ? [2] : [],
      3,
    ],
  );
  Expect.listEquals([1, 3], [1, ...?true ? null : [], 3]);

  var a = [0];
  Expect.listEquals(
    [1, 2, 3],
    [
      1,
      ...a = [2],
      3,
    ],
  );
  var nullableA = [0] as List<int>?;
  Expect.listEquals([1, 3], [1, ...?nullableA = null, 3]);

  var b = [2];
  Expect.listEquals([1, 2, 3, 4], [1, ...b..add(3), 4]);
  var nullableB = [2] as List<int>?;
  Expect.listEquals([1, 2, 3, 4], [1, ...?nullableB?..add(3), 4]);
}