library test /*isNonNullableByDefault*/;
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,ForNonNullableByDefault} (core::num) → void;
}
static method main() → dynamic {}