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: simple.rb
    path of file: ./repos/metasploit-framework/modules/nops/x64
    
    the code of the file until where you have to start completion: ##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Nop

  d
    
  def generate_sled( length, opts )
    badchars  = opts['BadChars'] || ''
    random    = opts['Random'] || datastore['RandomNops']
    badregs   = opts['SaveRegisters'] || []
    good_instructions = []
    sled      = ''

    # Weed out any instructions which will contain a bad char/instruction...
    INSTRUCTIONS.each do | instruction |
      good = true;
      # If the instruction contains some bad chars we wont use it...
      badchars.each_char do | bc |
        if instruction[I_OP].include?( bc )
          good = false
          break
        end
      end
      # if we are only to generate single byte instructions, weed out the multi byte ones...
      good = false if instruction[I_SIZE] > 0 and not datastore['MultiByte']

      good_instructions.push( instruction ) if good
    end