# File json/lexer.rb, line 76
    def nextclean
      while true
        c = self.nextchar()
        if (c == '/')
          case self.nextchar()
          when '/'
            c = self.nextchar()
            while c != "\n" && c != "\r" && c != "\0"
              c = self.nextchar()
            end
          when '*'
            while true
              c = self.nextchar()
              raise "unclosed comment" if (c == "\0")
              if (c == '*')
                break if (self.nextchar() == '/')
                self.back()
              end
            end
          else
            self.back()
            return '/';
          end
        elsif c == "\0" || c[0] > " "[0]
          return(c)
        end
      end
    end