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

class F3<T extends core::Object? = dynamic> extends core::Object {
  constructor •(core::Iterable<core::Iterable<self::F3::T%>> a) → self::F3<self::F3::T%>
    ;
}
class F4<T extends core::Object? = dynamic> extends core::Object {
  constructor •({required core::Iterable<core::Iterable<self::F4::T%>> a = null}) → self::F4<self::F4::T%>
    ;
}
static method main() → void
  ;