library /*isNonNullableByDefault*/;
//
// Problems in library:
//
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in.dart:21:7: Error: Applying the mixin 'Bq' to 'C0' introduces an erroneous override of 'a'.
// class DwBq0 extends C0 with Bq {}
//       ^^^^^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:12:33: Context: The return type of the method 'Bq.a' is 'List<int? Function(int?)>', which does not match the return type, 'List<int Function(int)>', of the overridden method, 'B.a'.
//  - 'List' is from 'dart:core'.
// Change to a subtype of 'List<int Function(int)>'.
//   List<int? Function(int?)> get a => [];
//                                 ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:6:31: Context: This is the overridden method ('a').
//   List<int Function(int)> get a => [];
//                               ^
//
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in.dart:21:7: Error: Applying the mixin 'Bq' to 'C0' introduces an erroneous override of 'm'.
// class DwBq0 extends C0 with Bq {}
//       ^^^^^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:14:23: Context: The return type of the method 'Bq.m' is 'int? Function(int?)', which does not match the return type, 'int Function(int)', of the overridden method, 'B.m'.
// Change to a subtype of 'int Function(int)'.
//   int? Function(int?) m(int? Function(int?) x) => x;
//                       ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:8:21: Context: This is the overridden method ('m').
//   int Function(int) m(int Function(int) x) => x;
//                     ^
//
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in.dart:30:7: Error: Applying the mixin 'B' to 'C3' introduces an erroneous override of 'a'.
// class DwB3 extends C3 with B {}
//       ^^^^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:6:31: Context: The return type of the method 'B.a' is 'List<int Function(int)>', which does not match the return type, 'List<int? Function(int?)>', of the overridden method, 'Bq.a'.
//  - 'List' is from 'dart:core'.
// Change to a subtype of 'List<int? Function(int?)>'.
//   List<int Function(int)> get a => [];
//                               ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:12:33: Context: This is the overridden method ('a').
//   List<int? Function(int?)> get a => [];
//                                 ^
//
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in.dart:30:7: Error: Applying the mixin 'B' to 'C3' introduces an erroneous override of 'm'.
// class DwB3 extends C3 with B {}
//       ^^^^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:8:21: Context: The return type of the method 'B.m' is 'int Function(int)', which does not match the return type, 'int? Function(int?)', of the overridden method, 'Bq.m'.
// Change to a subtype of 'int? Function(int?)'.
//   int Function(int) m(int Function(int) x) => x;
//                     ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:14:23: Context: This is the overridden method ('m').
//   int? Function(int?) m(int? Function(int?) x) => x;
//                       ^
//
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in.dart:15:7: Error: The implementation of 'a' in the non-abstract class 'DiBq0' does not conform to its interface.
// class DiBq0 extends C0 implements Bq {}
//       ^^^^^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:6:31: Context: The return type of the method 'B.a' is 'List<int Function(int)>', which does not match the return type, 'List<int? Function(int?)>', of the overridden method, 'Bq.a'.
//  - 'List' is from 'dart:core'.
// Change to a subtype of 'List<int? Function(int?)>'.
//   List<int Function(int)> get a => [];
//                               ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:12:33: Context: This is the overridden method ('a').
//   List<int? Function(int?)> get a => [];
//                                 ^
//
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in.dart:15:7: Error: Class 'DiBq0' inherits multiple members named 'a' with incompatible signatures.
// Try adding a declaration of 'a' to 'DiBq0'.
// class DiBq0 extends C0 implements Bq {}
//       ^^^^^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:6:31: Context: This is one of the inherited members.
//   List<int Function(int)> get a => [];
//                               ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:12:33: Context: This is one of the inherited members.
//   List<int? Function(int?)> get a => [];
//                                 ^
//
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in.dart:15:7: Error: The implementation of 'm' in the non-abstract class 'DiBq0' does not conform to its interface.
// class DiBq0 extends C0 implements Bq {}
//       ^^^^^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:8:21: Context: The return type of the method 'B.m' is 'int Function(int)', which does not match the return type, 'int? Function(int?)', of the overridden method, 'Bq.m'.
// Change to a subtype of 'int? Function(int?)'.
//   int Function(int) m(int Function(int) x) => x;
//                     ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:14:23: Context: This is the overridden method ('m').
//   int? Function(int?) m(int? Function(int?) x) => x;
//                       ^
//
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in.dart:15:7: Error: Class 'DiBq0' inherits multiple members named 'm' with incompatible signatures.
// Try adding a declaration of 'm' to 'DiBq0'.
// class DiBq0 extends C0 implements Bq {}
//       ^^^^^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:8:21: Context: This is one of the inherited members.
//   int Function(int) m(int Function(int) x) => x;
//                     ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:14:23: Context: This is one of the inherited members.
//   int? Function(int?) m(int? Function(int?) x) => x;
//                       ^
//
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in.dart:21:7: Error: Class 'C0 with Bq' inherits multiple members named 'a' with incompatible signatures.
// Try adding a declaration of 'a' to 'C0 with Bq'.
// class DwBq0 extends C0 with Bq {}
//       ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:12:33: Context: This is one of the inherited members.
//   List<int? Function(int?)> get a => [];
//                                 ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:6:31: Context: This is one of the inherited members.
//   List<int Function(int)> get a => [];
//                               ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:12:33: Context: This is one of the inherited members.
//   List<int? Function(int?)> get a => [];
//                                 ^
//
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in.dart:21:7: Error: Class 'C0 with Bq' inherits multiple members named 'm' with incompatible signatures.
// Try adding a declaration of 'm' to 'C0 with Bq'.
// class DwBq0 extends C0 with Bq {}
//       ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:14:23: Context: This is one of the inherited members.
//   int? Function(int?) m(int? Function(int?) x) => x;
//                       ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:8:21: Context: This is one of the inherited members.
//   int Function(int) m(int Function(int) x) => x;
//                     ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:14:23: Context: This is one of the inherited members.
//   int? Function(int?) m(int? Function(int?) x) => x;
//                       ^
//
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in.dart:24:7: Error: The implementation of 'a' in the non-abstract class 'DiB3' does not conform to its interface.
// class DiB3 extends C3 implements B {}
//       ^^^^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:12:33: Context: The return type of the method 'Bq.a' is 'List<int? Function(int?)>', which does not match the return type, 'List<int Function(int)>', of the overridden method, 'B.a'.
//  - 'List' is from 'dart:core'.
// Change to a subtype of 'List<int Function(int)>'.
//   List<int? Function(int?)> get a => [];
//                                 ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:6:31: Context: This is the overridden method ('a').
//   List<int Function(int)> get a => [];
//                               ^
//
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in.dart:24:7: Error: Class 'DiB3' inherits multiple members named 'a' with incompatible signatures.
// Try adding a declaration of 'a' to 'DiB3'.
// class DiB3 extends C3 implements B {}
//       ^^^^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:12:33: Context: This is one of the inherited members.
//   List<int? Function(int?)> get a => [];
//                                 ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:6:31: Context: This is one of the inherited members.
//   List<int Function(int)> get a => [];
//                               ^
//
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in.dart:24:7: Error: The implementation of 'm' in the non-abstract class 'DiB3' does not conform to its interface.
// class DiB3 extends C3 implements B {}
//       ^^^^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:14:23: Context: The return type of the method 'Bq.m' is 'int? Function(int?)', which does not match the return type, 'int Function(int)', of the overridden method, 'B.m'.
// Change to a subtype of 'int Function(int)'.
//   int? Function(int?) m(int? Function(int?) x) => x;
//                       ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:8:21: Context: This is the overridden method ('m').
//   int Function(int) m(int Function(int) x) => x;
//                     ^
//
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in.dart:24:7: Error: Class 'DiB3' inherits multiple members named 'm' with incompatible signatures.
// Try adding a declaration of 'm' to 'DiB3'.
// class DiB3 extends C3 implements B {}
//       ^^^^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:14:23: Context: This is one of the inherited members.
//   int? Function(int?) m(int? Function(int?) x) => x;
//                       ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:8:21: Context: This is one of the inherited members.
//   int Function(int) m(int Function(int) x) => x;
//                     ^
//
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in.dart:30:7: Error: Class 'C3 with B' inherits multiple members named 'a' with incompatible signatures.
// Try adding a declaration of 'a' to 'C3 with B'.
// class DwB3 extends C3 with B {}
//       ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:6:31: Context: This is one of the inherited members.
//   List<int Function(int)> get a => [];
//                               ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:12:33: Context: This is one of the inherited members.
//   List<int? Function(int?)> get a => [];
//                                 ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:6:31: Context: This is one of the inherited members.
//   List<int Function(int)> get a => [];
//                               ^
//
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in.dart:30:7: Error: Class 'C3 with B' inherits multiple members named 'm' with incompatible signatures.
// Try adding a declaration of 'm' to 'C3 with B'.
// class DwB3 extends C3 with B {}
//       ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:8:21: Context: This is one of the inherited members.
//   int Function(int) m(int Function(int) x) => x;
//                     ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:14:23: Context: This is one of the inherited members.
//   int? Function(int?) m(int? Function(int?) x) => x;
//                       ^
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib2.dart:8:21: Context: This is one of the inherited members.
//   int Function(int) m(int Function(int) x) => x;
//                     ^
//
import self as self;
import "mixin_from_opt_in_out_in_lib1.dart" as mix;
import "mixin_from_opt_in_out_in_lib2.dart" as mix2;

import "org-dartlang-testcase:///mixin_from_opt_in_out_in_lib1.dart";
import "org-dartlang-testcase:///mixin_from_opt_in_out_in_lib2.dart";

class DiB0 extends mix::C0 implements mix2::B {
  synthetic constructor •() → self::DiB0
    ;
}
class DiBq0 extends mix::C0 implements mix2::Bq {
  synthetic constructor •() → self::DiBq0
    ;
}
abstract class _DwB0&C0&B = mix::C0 with mix2::B /*isAnonymousMixin*/  {
  synthetic constructor •() → self::_DwB0&C0&B
    : super mix::C0::•()
    ;
}
class DwB0 extends self::_DwB0&C0&B {
  synthetic constructor •() → self::DwB0
    ;
}
abstract class _DwBq0&C0&Bq = mix::C0 with mix2::Bq /*isAnonymousMixin*/  {
  synthetic constructor •() → self::_DwBq0&C0&Bq
    : super mix::C0::•()
    ;
}
class DwBq0 extends self::_DwBq0&C0&Bq {
  synthetic constructor •() → self::DwBq0
    ;
}
class DiB3 extends mix::C3 implements mix2::B {
  synthetic constructor •() → self::DiB3
    ;
}
class DiBq3 extends mix::C3 implements mix2::Bq {
  synthetic constructor •() → self::DiBq3
    ;
}
abstract class _DwB3&C3&B = mix::C3 with mix2::B /*isAnonymousMixin*/  {
  synthetic constructor •() → self::_DwB3&C3&B
    : super mix::C3::•()
    ;
}
class DwB3 extends self::_DwB3&C3&B {
  synthetic constructor •() → self::DwB3
    ;
}
abstract class _DwBq3&C3&Bq = mix::C3 with mix2::Bq /*isAnonymousMixin*/  {
  synthetic constructor •() → self::_DwBq3&C3&Bq
    : super mix::C3::•()
    ;
}
class DwBq3 extends self::_DwBq3&C3&Bq {
  synthetic constructor •() → self::DwBq3
    ;
}
static method main() → dynamic
  ;

library /*isNonNullableByDefault*/;
//
// Problems in library:
//
// pkg/front_end/testcases/nnbd_mixed/mixin_from_opt_in_out_in_lib1.dart:5:1: Error: A library can't opt out of non-nullable by default, when in nnbd-strong mode.
// // @dart=2.6
// ^^^^^^^^^^^^
//
import self as mix;
import "mixin_from_opt_in_out_in_lib2.dart" as mix2;

import "org-dartlang-testcase:///mixin_from_opt_in_out_in_lib2.dart";

class C0 extends mix2::B {
  synthetic constructor •() → mix::C0
    ;
}
class C3 extends mix2::Bq {
  synthetic constructor •() → mix::C3
    ;
}

library /*isNonNullableByDefault*/;
import self as mix2;
import "dart:core" as core;

class B extends core::Object {
  synthetic constructor •() → mix2::B
    ;
  get a() → core::List<(core::int) → core::int>
    ;
  set a(core::List<(core::int) → core::int> _) → void
    ;
  method m((core::int) → core::int x) → (core::int) → core::int
    ;
}
class Bq extends core::Object {
  synthetic constructor •() → mix2::Bq
    ;
  get a() → core::List<(core::int?) → core::int?>
    ;
  set a(core::List<(core::int?) → core::int?> _) → void
    ;
  method m((core::int?) → core::int? x) → (core::int?) → core::int?
    ;
}