def aliases
      list = []
      return list unless namespace.is_a?(HeaderObject)
      namespace.aliases.each do |o, aname|
        list << o if aname == name && o.scope == scope
      end
      list
    end
def aliases
      list = []
      return list unless namespace.is_a?(HeaderObject)
      namespace.aliases.each do |o, aname|
        list << o if aname == name && o.scope == scope
      end
      list
    end
Returns all alias names of the object
 @return [Array<Symbol>] the alias names