| library test; | 
 | import self as self; | 
 | import "dart:core" as core; | 
 |  | 
 | typedef F<contravariant T extends core::Object? = dynamic> = (T%) → dynamic; | 
 | class C<T extends core::Object? = dynamic> extends core::Object { | 
 |   synthetic constructor •() → self::C<self::C::T%> | 
 |     : super core::Object::•() | 
 |     ; | 
 |   method f(covariant-by-class self::C::T% x) → void {} | 
 |   method g1(covariant-by-class self::C::T% x) → void { | 
 |     this.{self::C::f}(x){(self::C::T%) → void}; | 
 |   } | 
 |   method g2(covariant-by-class self::C::T% x) → void { | 
 |     this.{self::C::f}(x){(self::C::T%) → void}; | 
 |   } | 
 |   method g3(covariant-by-class self::C<self::C::T%> c, covariant-by-class self::C::T% x) → void { | 
 |     c.{self::C::f}(x){(self::C::T%) → void}; | 
 |   } | 
 |   method g4() → (self::C::T%) → dynamic | 
 |     return this.{self::C::f}{(self::C::T%) → void}; | 
 | } | 
 | class D extends self::C<core::int> { | 
 |   synthetic constructor •() → self::D | 
 |     : super self::C::•() | 
 |     ; | 
 | } | 
 | class E extends self::C<core::num> { | 
 |   synthetic constructor •() → self::E | 
 |     : super self::C::•() | 
 |     ; | 
 |   method f(covariant-by-declaration covariant-by-class core::int x) → void {} | 
 | } | 
 | static method test() → dynamic { | 
 |   (core::Object) → dynamic x = (new self::D::•().{self::C::g4}(){() → (core::int) → dynamic} as{TypeError,CovarianceCheck} (core::int) → dynamic) as (core::Object) → dynamic; | 
 |   x("hi"){(core::Object) → dynamic}; | 
 |   new self::E::•().{self::C::g1}(1.5){(core::num) → void}; | 
 | } | 
 | static method main() → dynamic {} |