class Thor::Arguments

def check_requirement!
  return if @non_assigned_required.empty?
  names = @non_assigned_required.map do |o|
    o.respond_to?(:switch_name) ? o.switch_name : o.human_name
  end.join("', '")
  class_name = self.class.name.split("::").last.downcase
  raise RequiredArgumentMissingError, "No value provided for required #{class_name} '#{names}'"
end