library /*isNonNullableByDefault*/;
//
// Problems in library:
//
// pkg/front_end/testcases/general/abstract_overrides_concrete.dart:17:7: Error: The implementation of 'foo' in the non-abstract class 'C' does not conform to its interface.
// class C extends B {}
//       ^
// pkg/front_end/testcases/general/abstract_overrides_concrete.dart:6:8: Context: The method 'A.foo' has fewer positional arguments than those of overridden method 'B.foo'.
//   void foo() {}
//        ^
// pkg/front_end/testcases/general/abstract_overrides_concrete.dart:14:8: Context: This is the overridden method ('foo').
//   void foo([a]);
//        ^
//
// pkg/front_end/testcases/general/abstract_overrides_concrete.dart:19:7: Error: The implementation of 'foo' in the non-abstract class 'D' does not conform to its interface.
// class D extends A implements I {}
//       ^
// pkg/front_end/testcases/general/abstract_overrides_concrete.dart:6:8: Context: The method 'A.foo' has fewer positional arguments than those of overridden method 'I.foo'.
//   void foo() {}
//        ^
// pkg/front_end/testcases/general/abstract_overrides_concrete.dart:10:8: Context: This is the overridden method ('foo').
//   void foo([a]);
//        ^
//
// pkg/front_end/testcases/general/abstract_overrides_concrete.dart:23:7: Error: The implementation of 'foo' in the non-abstract class 'F' does not conform to its interface.
// class F extends E {}
//       ^
// pkg/front_end/testcases/general/abstract_overrides_concrete.dart:6:8: Context: The method 'A.foo' has fewer positional arguments than those of overridden method 'I.foo'.
//   void foo() {}
//        ^
// pkg/front_end/testcases/general/abstract_overrides_concrete.dart:10:8: Context: This is the overridden method ('foo').
//   void foo([a]);
//        ^
//
import self as self;
import "dart:core" as core;

class A extends core::Object {
  synthetic constructor •() → self::A
    : super core::Object::•()
    ;
  method foo() → void {}
}
abstract class I extends core::Object {
  synthetic constructor •() → self::I
    : super core::Object::•()
    ;
  abstract method foo([dynamic a = #C1]) → void;
}
abstract class B extends self::A {
  synthetic constructor •() → self::B
    : super self::A::•()
    ;
  abstract method foo([dynamic a = #C1]) → void;
}
class C extends self::B {
  synthetic constructor •() → self::C
    : super self::B::•()
    ;
}
class D extends self::A implements self::I {
  synthetic constructor •() → self::D
    : super self::A::•()
    ;
  abstract member-signature method foo([dynamic a = #C1]) → void; -> self::I::foo
}
abstract class E extends self::A implements self::I {
  synthetic constructor •() → self::E
    : super self::A::•()
    ;
  abstract member-signature method foo([dynamic a = #C1]) → void; -> self::I::foo
}
class F extends self::E {
  synthetic constructor •() → self::F
    : super self::E::•()
    ;
}
static method main() → dynamic {}

constants  {
  #C1 = null
}