pkg/front_end/testcases/regress/issue_31155.dart

// Copyright (c) 2017, 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=2.9
class A {}

class B {
}

class C {
  var f = Map<A, B> {};
}

void main() {}