pkg/front_end/testcases/general/assign_to_initializing_formal.dart

// 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.
// @dart=2.9
import "package:expect/expect.dart";

class A {
  var x, y;
  // This should cause an error because `x` is final when accessed as an
  // initializing formal.
  A(this.x)
      : y = (() {
          x = 3;
        });
}

main() {}