blob: 7a3daa67fd0c988fc208899030b2e408bd30a177 [file] [log] [blame]
// 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.
/// @assertion From the Unified collection Spec:
/// A [spreadElement] starting with [...?] is a constant element if its
/// expression is constant and it evaluates to [null] or a constant [List], [Set]
/// or [Map] instance originally created by a list, set or map literal. It is a
/// potentially constant element if the expression is potentially constant
/// expression.
/// @description: Checks that constant map spread [...?] element can only be a
/// constant map or null.
/// @author
main() {
const Map res1 = const {...?({1: 1, 2: 2} as Map?), 4: 3};
const Map res2 = const {...?(<Object, Object>{} as Map?)};
const Map res3 = const {...?{}};
// ^^^^
// ^
// [cfe] Operand of null-aware operation '...?' has type 'Map<dynamic, dynamic>' which excludes null.
const Map res4 = const {...?null};