You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: initialize_class.rb
    path of file: ./repos/sorbet/test/testdata/infer/generics
    
    the code of the file until where you have to start completion: # typed: strict
class Module; include T::Sig; end

modu
    
  def foo; end

  module Factory
    extend T::Generic
    interface!

    has_attached_class!

    sig {abstract.returns(T.attached_class)}
    def new; end
  end
  mixes_in_class_methods(Factory)
end