| library test; | 
 | import self as self; | 
 | import "dart:core" as core; | 
 |  | 
 | typedef F<contravariant T extends core::Object? = dynamic> = (T%) → void; | 
 | class C<T extends core::Object? = dynamic> extends core::Object { | 
 |   synthetic constructor •() → self::C<self::C::T%> | 
 |     : super core::Object::•() | 
 |     ; | 
 |   operator [](core::int i) → (self::C::T%) → void | 
 |     return throw ""; | 
 | } | 
 | static method test(self::C<core::num> c) → (core::num) → void { | 
 |   return c.{self::C::[]}(0){(core::int) → (core::num) → void} as{TypeError,CovarianceCheck} (core::num) → void; | 
 | } | 
 | static method main() → dynamic {} |