// 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
/*@testedFeatures=inference*/
library test;

// All of these cases are error conditions; this test checks how we recover.

abstract class A {
  int f(int x, int y);
  int g(int x, [int y]);
  int h(int x, {int y});
  int i(int x, {int y});
}

abstract class B {
  int f(int x);
  int g(int x);
  int h(int x);
  int i(int x, {int z});
}

abstract class C implements A, B {
  f(x, y);
  g(x, [y]);
  h(x, {y});
  i(x, {y, z});
}

main() {}