def to_constant_name(desc) #:nodoc:
      case desc
      when String then desc.sub(/^::/, "")
      when Symbol then desc.to_s
      when Module
        desc.name ||
          raise(ArgumentError, "Anonymous modules have no name to be referenced by")
      else raise TypeError, "Not a valid constant descriptor: #{desc.inspect}"
      end
    end
def to_constant_name(desc) #:nodoc:
      case desc
      when String then desc.sub(/^::/, "")
      when Symbol then desc.to_s
      when Module
        desc.name ||
          raise(ArgumentError, "Anonymous modules have no name to be referenced by")
      else raise TypeError, "Not a valid constant descriptor: #{desc.inspect}"
      end
    end
Convert the provided const desc to a qualified constant name (as a string).
 A module, class, symbol, or string may be provided.