You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: basic_block.rb
    path of file: ./repos/fisk/lib/fisk
    
    the code of the file until where you have to start completion: class Fisk
  class CFG < Struct.new(:variables, :blocks)
    class BasicBlock < Struct.new(:name, :insns, :fall, :jump, :def, :use, :in, :out, :pred, :start_point, :end_point)
      def jump?
        insns.last.jump?
      end

      def jump_name
        insns.last.target
      end

      def succ
        list = []
        list << fall if fall
        list << jump if jump
        list
      end

      def live; self.def
    
    def self.live_variables blocks
      seen = Set.new

      blocks.each do |block|
        used = Set.new
        defd = Set.new

        block.insns.each do |insn|
          if insn.has_temp_registers?
            insn.temp_registers.each do |reg|
              defd << reg unless seen.include?(reg)
              used << reg unless defd.include?(reg)
              seen << reg
            end
          end
        end

        block.use = used.to_a
        block.def = defd.to_a
        block.in  = []
        block.out = []
      end