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// 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 An expression of the form [e is T] or [e is! T] is accepted as a
/// potentially and compile-time constant expression if [e] is potentially
/// constant or compile-time constant, respectively, and [T] is a compile-time
/// constant type.
/// @description Checks that an expression of the form [e is! T] is not accepted
/// if [e] is not a constant
/// @author
Object str = "test";
main() {
const bool check = str is! String;
// ^
// [analyzer] unspecified
// [cfe] unspecified