def_token

# File lib/rdoc/parser/ruby.rb, line 274
  def self.def_token(token_n, super_token = Token, reading = nil, *opts)
    token_n = token_n.id2name unless String === token_n

    fail AlreadyDefinedToken, token_n if const_defined?(token_n)

    token_c =  Class.new super_token
    const_set token_n, token_c
#    token_c.inspect

    if reading
      if TkReading2Token[reading]
        fail TkReading2TokenDuplicateError, token_n, reading
      end
      if opts.empty?
        TkReading2Token[reading] = [token_c]
      else
        TkReading2Token[reading] = [token_c].concat(opts)
      end
    end
    TkSymbol2Token[token_n.intern] = token_c

    if token_c <= TkOp
      token_c.class_eval %{
        def self.op_name; "#{reading}"; end
      }
    end
  end