|  | // | 
|  | // Problems outside component: | 
|  | // | 
|  | // pkg/front_end/testcases/class_modifiers/ffi_exception.dart: Error: Class 'Object' cannot be extended or implemented. | 
|  | // | 
|  | library; | 
|  | // | 
|  | // Problems in library: | 
|  | // | 
|  | // pkg/front_end/testcases/class_modifiers/ffi_exception.dart:11:7: Error: Can't use 'Double' as a mixin because it has constructors. | 
|  | // class WithFinal with Double {} /* Error */ | 
|  | //       ^ | 
|  | // sdk/lib/ffi/native_type.dart:115:9: Context: This constructor prevents using 'Double' as a mixin. | 
|  | //   const Double(); | 
|  | //         ^ | 
|  | // | 
|  | // pkg/front_end/testcases/class_modifiers/ffi_exception.dart:11:22: Error: The class 'Double' can't be used as a mixin because it isn't a mixin class nor a mixin. | 
|  | // class WithFinal with Double {} /* Error */ | 
|  | //                      ^ | 
|  | // | 
|  | // pkg/front_end/testcases/class_modifiers/ffi_exception.dart:13:34: Error: The class 'Double' can't be implemented outside of its library because it's a final class. | 
|  | // class ImplementsFinal implements Double {} /* Error */ | 
|  | //                                  ^ | 
|  | // | 
|  | // pkg/front_end/testcases/class_modifiers/ffi_exception.dart:15:28: Error: The class 'Double' can't be extended outside of its library because it's a final class. | 
|  | // class ExtendsFinal extends Double {} /* Error */ | 
|  | //                            ^ | 
|  | // | 
|  | // pkg/front_end/testcases/class_modifiers/ffi_exception.dart:22:33: Error: The class 'Opaque' can't be implemented outside of its library because it's a base class. | 
|  | // class ImplementsBase implements Opaque {} /* Error */ | 
|  | //                                 ^ | 
|  | // | 
|  | // pkg/front_end/testcases/class_modifiers/ffi_exception.dart:26:32: Error: The class 'Finalizable' can't be extended outside of its library because it's an interface class. | 
|  | // class ExtendsInterface extends Finalizable {} /* Error */ | 
|  | //                                ^ | 
|  | // | 
|  | // pkg/front_end/testcases/class_modifiers/ffi_exception.dart:11:22: Error: The class 'Double' can't be used as a mixin because it extends a class other than 'Object'. | 
|  | // class WithFinal with Double {} /* Error */ | 
|  | //                      ^ | 
|  | // | 
|  | // pkg/front_end/testcases/class_modifiers/ffi_exception.dart:26:7: Error: The superclass, 'Finalizable', has no unnamed constructor that takes no arguments. | 
|  | // class ExtendsInterface extends Finalizable {} /* Error */ | 
|  | //       ^ | 
|  | // | 
|  | import self as self; | 
|  | import "dart:core" as core; | 
|  | import "dart:ffi" as ffi; | 
|  |  | 
|  | import "dart:ffi"; | 
|  |  | 
|  | abstract final class _WithFinal&Object&Double extends core::Object implements ffi::Double /*isAnonymousMixin,isEliminatedMixin,hasConstConstructor*/  { | 
|  | const synthetic constructor •() → self::_WithFinal&Object&Double | 
|  | : super core::Object::•() | 
|  | ; | 
|  | } | 
|  | class WithFinal extends self::_WithFinal&Object&Double { | 
|  | synthetic constructor •() → self::WithFinal | 
|  | : super self::_WithFinal&Object&Double::•() | 
|  | ; | 
|  | } | 
|  | class ImplementsFinal extends core::Object implements ffi::Double { | 
|  | synthetic constructor •() → self::ImplementsFinal | 
|  | : super core::Object::•() | 
|  | ; | 
|  | } | 
|  | class ExtendsFinal extends ffi::Double { | 
|  | synthetic constructor •() → self::ExtendsFinal | 
|  | : super ffi::Double::•() | 
|  | ; | 
|  | } | 
|  | class ExtendsBase extends ffi::Opaque { | 
|  | synthetic constructor •() → self::ExtendsBase | 
|  | : super ffi::Opaque::•() | 
|  | ; | 
|  | } | 
|  | class ImplementsBase extends core::Object implements ffi::Opaque { | 
|  | synthetic constructor •() → self::ImplementsBase | 
|  | : super core::Object::•() | 
|  | ; | 
|  | } | 
|  | class ExtendsInterface extends ffi::Finalizable { | 
|  | synthetic constructor •() → self::ExtendsInterface | 
|  | : invalid-initializer | 
|  | ; | 
|  | } |