module T::Helpers

def abstract!
  if defined?(super)
    # This is to play nicely with Rails' AbstractController::Base,
    # which also defines an `abstract!` method.
    # https://api.rubyonrails.org/classes/AbstractController/Base.html#method-c-abstract-21
    super
  end
  Private::Abstract::Declare.declare_abstract(self, type: :abstract)
end