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

class Foo<T extends core::Object? = dynamic> extends core::Object {
  covariant-by-class field self::Foo::T% x;
  constructor from(core::String _init) → self::Foo<self::Foo::T%>
    ;
  constructor _internal({required self::Foo::T% x = null}) → self::Foo<self::Foo::T%>
    ;
}
static method main() → void
  ;