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// TODO(multitest): This was automatically migrated from a multitest and may
// contain strange or dead code.
// @dart = 2.9
// 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.
class B {}
class C {
B call(B b) => b;
typedef B BToB(B x);
class D {
BToB f() => null;
void g(C x) {}
class E extends D {
// This override is illegal because C is not a subtype of BToB.
// This override is illegal because BToB is not a supertype of C.
main() {
new E();