| library /*isNonNullableByDefault*/; | 
 | // | 
 | // Problems in library: | 
 | // | 
 | // pkg/front_end/testcases/nnbd_mixed/issue41498.dart:11:5: Error: Non-nullable variable 'f' must be assigned before it can be used. | 
 | //     f.toString(); // error | 
 | //     ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd_mixed/issue41498.dart:17:5: Error: Non-nullable variable 'f' must be assigned before it can be used. | 
 | //     f.toString(); // error | 
 | //     ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd_mixed/issue41498.dart:24:3: Error: Non-nullable variable 'f' must be assigned before it can be used. | 
 | //   f.toString(); // error | 
 | //   ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd_mixed/issue41498.dart:29:5: Error: Non-nullable variable 'f' must be assigned before it can be used. | 
 | //     f.toString(); // error | 
 | //     ^ | 
 | // | 
 | import self as self; | 
 | import "dart:core" as core; | 
 |  | 
 | import "org-dartlang-testcase:///issue41498_lib.dart"; | 
 |  | 
 | class C extends core::Object { | 
 |   synthetic constructor •() → self::C | 
 |     : super core::Object::•() | 
 |     ; | 
 |   static method test() → void { | 
 |     () → void f; | 
 |     invalid-expression "pkg/front_end/testcases/nnbd_mixed/issue41498.dart:11:5: Error: Non-nullable variable 'f' must be assigned before it can be used. | 
 |     f.toString(); // error | 
 |     ^" in f.{core::Object::toString}(){() → core::String}; | 
 |   } | 
 |   method test2() → void { | 
 |     () → void f; | 
 |     invalid-expression "pkg/front_end/testcases/nnbd_mixed/issue41498.dart:17:5: Error: Non-nullable variable 'f' must be assigned before it can be used. | 
 |     f.toString(); // error | 
 |     ^" in f.{core::Object::toString}(){() → core::String}; | 
 |   } | 
 | } | 
 | static method test() → dynamic { | 
 |   () → void f; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd_mixed/issue41498.dart:24:3: Error: Non-nullable variable 'f' must be assigned before it can be used. | 
 |   f.toString(); // error | 
 |   ^" in f.{core::Object::toString}(){() → core::String}; | 
 |   core::Function foo = () → Null { | 
 |     () → void f; | 
 |     invalid-expression "pkg/front_end/testcases/nnbd_mixed/issue41498.dart:29:5: Error: Non-nullable variable 'f' must be assigned before it can be used. | 
 |     f.toString(); // error | 
 |     ^" in f.{core::Object::toString}(){() → core::String}; | 
 |   }; | 
 |   self::C::test(); | 
 |   new self::C::•().{self::C::test2}(){() → void}; | 
 | } | 
 | static method main() → dynamic {} | 
 |  | 
 | library opted_out_lib; | 
 | import self as self2; | 
 | import "dart:core" as core; | 
 |  | 
 | typedef LegacyFoo = () →* void; | 
 | class C extends core::Object { | 
 |   synthetic constructor •() → self2::C* | 
 |     : super core::Object::•() | 
 |     ; | 
 |   static method test() → void { | 
 |     () →* void f; | 
 |     f.{core::Object::toString}(){() →* core::String*}; | 
 |   } | 
 |   method test2() → void { | 
 |     () →* void f; | 
 |     f.{core::Object::toString}(){() →* core::String*}; | 
 |   } | 
 |   abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode | 
 |   abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf | 
 |   abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf | 
 |   abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue | 
 |   abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse | 
 |   abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::== | 
 |   abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode | 
 |   abstract member-signature method toString() → core::String*; -> core::Object::toString | 
 |   abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod | 
 |   abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType | 
 | } | 
 | static method test() → dynamic { | 
 |   () →* void f; | 
 |   f.{core::Object::toString}(){() →* core::String*}; | 
 |   core::Function* foo = () → Null { | 
 |     () →* void f; | 
 |     f.{core::Object::toString}(){() →* core::String*}; | 
 |   }; | 
 |   self2::C::test(); | 
 |   new self2::C::•().{self2::C::test2}(){() →* void}; | 
 | } |