body_fld_lang() private

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# File lib/net/imap.rb, line 2662
      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
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