library /*isNonNullableByDefault*/;
import self as self;
import "dart:core" as core;

class A<T extends core::Object? = dynamic> extends core::Object {
  field (self::A::T%) → void f;
  constructor •((self::A::T%) → void f) → self::A<self::A::T%>
    ;
  method foo(covariant-by-class self::A::T% x) → dynamic
    ;
}
static method main() → dynamic
  ;