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// Copyright (c) 2018, 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.
// Dart test program to test arithmetic operations.
import "package:expect/expect.dart";
class B {}
class C {
B call(B b) => b;
typedef B BToB(B x);
C c = null;
void check(BToB f) {
main() {
// The implicit tear-off of `.call` should be tolerant of `null`.
check(c); // Equivalent to `check(c?.call);`