library /*isNonNullableByDefault*/;
//
// Problems in library:
//
// pkg/front_end/testcases/general/invalid_operator_override.dart:13:18: Error: The parameter 'b' of the method 'B.+' has type 'B', which does not match the corresponding type, 'A', in the overridden method, 'A.+'.
//  - 'B' is from 'pkg/front_end/testcases/general/invalid_operator_override.dart'.
//  - 'A' is from 'pkg/front_end/testcases/general/invalid_operator_override.dart'.
// Change to a supertype of 'A', or, for a covariant parameter, a subtype.
//   A operator +(B b) => b;
//                  ^
// pkg/front_end/testcases/general/invalid_operator_override.dart:6:14: Context: This is the overridden method ('+').
//   A operator +(A a) => a;
//              ^
//
// pkg/front_end/testcases/general/invalid_operator_override.dart:14:14: Error: The return type of the method 'B.unary-' is 'A', which does not match the return type, 'B', of the overridden method, 'A.unary-'.
//  - 'A' is from 'pkg/front_end/testcases/general/invalid_operator_override.dart'.
//  - 'B' is from 'pkg/front_end/testcases/general/invalid_operator_override.dart'.
// Change to a subtype of 'B'.
//   A operator -() => this;
//              ^
// pkg/front_end/testcases/general/invalid_operator_override.dart:7:14: Context: This is the overridden method ('unary-').
//   B operator -() => new B();
//              ^
//
// pkg/front_end/testcases/general/invalid_operator_override.dart:15:19: Error: The parameter 'b' of the method 'B.[]' has type 'B', which does not match the corresponding type, 'A', in the overridden method, 'A.[]'.
//  - 'B' is from 'pkg/front_end/testcases/general/invalid_operator_override.dart'.
//  - 'A' is from 'pkg/front_end/testcases/general/invalid_operator_override.dart'.
// Change to a supertype of 'A', or, for a covariant parameter, a subtype.
//   B operator [](B b) => b;
//                   ^
// pkg/front_end/testcases/general/invalid_operator_override.dart:8:14: Context: This is the overridden method ('[]').
//   B operator [](A a) => new B();
//              ^
//
// pkg/front_end/testcases/general/invalid_operator_override.dart:16:23: Error: The parameter 'b' of the method 'B.[]=' has type 'B', which does not match the corresponding type, 'A', in the overridden method, 'A.[]='.
//  - 'B' is from 'pkg/front_end/testcases/general/invalid_operator_override.dart'.
//  - 'A' is from 'pkg/front_end/testcases/general/invalid_operator_override.dart'.
// Change to a supertype of 'A', or, for a covariant parameter, a subtype.
//   void operator []=(B b, A a) {}
//                       ^
// pkg/front_end/testcases/general/invalid_operator_override.dart:9:17: Context: This is the overridden method ('[]=').
//   void operator []=(A a1, A a2) {}
//                 ^
//
// pkg/front_end/testcases/general/invalid_operator_override.dart:20:14: Error: The return type of the method 'C.[]' is 'A', which does not match the return type, 'B', of the overridden method, 'A.[]'.
//  - 'A' is from 'pkg/front_end/testcases/general/invalid_operator_override.dart'.
//  - 'B' is from 'pkg/front_end/testcases/general/invalid_operator_override.dart'.
// Change to a subtype of 'B'.
//   A operator [](B b) => b;
//              ^
// pkg/front_end/testcases/general/invalid_operator_override.dart:8:14: Context: This is the overridden method ('[]').
//   B operator [](A a) => new B();
//              ^
//
// pkg/front_end/testcases/general/invalid_operator_override.dart:20:19: Error: The parameter 'b' of the method 'C.[]' has type 'B', which does not match the corresponding type, 'A', in the overridden method, 'A.[]'.
//  - 'B' is from 'pkg/front_end/testcases/general/invalid_operator_override.dart'.
//  - 'A' is from 'pkg/front_end/testcases/general/invalid_operator_override.dart'.
// Change to a supertype of 'A', or, for a covariant parameter, a subtype.
//   A operator [](B b) => b;
//                   ^
// pkg/front_end/testcases/general/invalid_operator_override.dart:8:14: Context: This is the overridden method ('[]').
//   B operator [](A a) => new B();
//              ^
//
// pkg/front_end/testcases/general/invalid_operator_override.dart:21:28: Error: The parameter 'b' of the method 'C.[]=' has type 'B', which does not match the corresponding type, 'A', in the overridden method, 'A.[]='.
//  - 'B' is from 'pkg/front_end/testcases/general/invalid_operator_override.dart'.
//  - 'A' is from 'pkg/front_end/testcases/general/invalid_operator_override.dart'.
// Change to a supertype of 'A', or, for a covariant parameter, a subtype.
//   void operator []=(A a, B b) {}
//                            ^
// pkg/front_end/testcases/general/invalid_operator_override.dart:9:17: Context: This is the overridden method ('[]=').
//   void operator []=(A a1, A a2) {}
//                 ^
//
import self as self;
import "dart:core" as core;

class A extends core::Object {
  synthetic constructor •() → self::A
    : super core::Object::•()
    ;
  operator +(self::A a) → self::A
    return a;
  operator unary-() → self::B
    return new self::B::•();
  operator [](self::A a) → self::B
    return new self::B::•();
  operator []=(self::A a1, self::A a2) → void {}
}
class B extends self::A {
  synthetic constructor •() → self::B
    : super self::A::•()
    ;
  operator +(self::B b) → self::A
    return b;
  operator unary-() → self::A
    return this;
  operator [](self::B b) → self::B
    return b;
  operator []=(self::B b, self::A a) → void {}
}
class C extends self::A {
  synthetic constructor •() → self::C
    : super self::A::•()
    ;
  operator [](self::B b) → self::A
    return b;
  operator []=(self::A a, self::B b) → void {}
}
static method main() → dynamic {}