library /*isNonNullableByDefault*/;
//
// Problems in library:
//
// pkg/front_end/testcases/nnbd/issue42603.dart:18:17: Error: Operator '==' should have exactly one parameter.
//   bool operator ==() => true;
//                 ^^
//
// pkg/front_end/testcases/nnbd/issue42603.dart:18:17: Error: The method 'E.==' has fewer positional arguments than those of overridden method 'Object.=='.
//   bool operator ==() => true;
//                 ^
// sdk/lib/_internal/vm/lib/object_patch.dart:21:26: Context: This is the overridden method ('==').
//   external bool operator ==(Object other);
//                          ^
//
// pkg/front_end/testcases/nnbd/issue42603.dart:22:17: Error: The method 'F.==' has more required arguments than those of overridden method 'E.=='.
//   bool operator ==(Object? other) => super == other;
//                 ^
// pkg/front_end/testcases/nnbd/issue42603.dart:18:17: Context: This is the overridden method ('==').
//   bool operator ==() => true;
//                 ^
//
// pkg/front_end/testcases/nnbd/issue42603.dart:22:44: Error: Too many positional arguments: 0 allowed, but 1 found.
// Try removing the extra positional arguments.
//   bool operator ==(Object? other) => super == other;
//                                            ^
//
import self as self;
import "dart:core" as core;

class C extends core::Object {
  synthetic constructor •() → self::C
    : super core::Object::•()
    ;
  operator ==(core::Object other) → core::bool
    return true;
}
class D extends self::C {
  synthetic constructor •() → self::D
    : super self::C::•()
    ;
  operator ==(core::Object? other) → core::bool
    return super.{self::C::==}(other);
  method method1(dynamic o) → core::bool
    return super.{self::C::==}(o);
  method method2(Null o) → core::bool
    return super.{self::C::==}(o);
}
class E extends core::Object {
  synthetic constructor •() → self::E
    : super core::Object::•()
    ;
  operator ==() → core::bool
    return true;
}
class F extends self::E {
  synthetic constructor •() → self::F
    : super self::E::•()
    ;
  operator ==(core::Object? other) → core::bool
    return invalid-expression "pkg/front_end/testcases/nnbd/issue42603.dart:22:44: Error: Too many positional arguments: 0 allowed, but 1 found.
Try removing the extra positional arguments.
  bool operator ==(Object? other) => super == other;
                                           ^" in super.{self::E::==}(other);
}
static method main() → dynamic {
  self::expect(true, new self::D::•() =={self::D::==}{(core::Object?) → core::bool} new self::D::•());
  self::expect(false, new self::D::•().{self::D::method1}(null){(dynamic) → core::bool});
  self::expect(false, new self::D::•().{self::D::method2}(null){(Null) → core::bool});
}
static method expect(dynamic expected, dynamic actual) → dynamic {
  if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
    throw "Expected ${expected}, actual ${actual}";
}