body_fld_lang

# File lib/net/imap.rb, line 2520
      def body_fld_lang
        token = lookahead
        if token.symbol == T_LPAR
          shift_token
          result = []
          while true
            token = lookahead
            case token.symbol
            when T_RPAR
              shift_token
              return result
            when T_SPACE
              shift_token
            end
            result.push(case_insensitive_string)
          end
        else
          lang = nstring
          if lang
            return lang.upcase
          else
            return lang
          end
        end
      end