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: installer_set.rb
    path of file: ./repos/rubygems/lib/rubygems/resolver
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

##
# A set of gems for installation sourced from remote sources and local .gem
# files

class Gem::Resolver::InstallerSet < Gem::Resolver::Set
  ##
  # List of 
    
  def ensure_required_rubygems_version_met(spec) # :nodoc:
    if rrgv = spec.required_rubygems_version
      unless rrgv.satisfied_by? Gem.rubygems_version
        rg_version = Gem::VERSION
        raise Gem::RuntimeRequirementNotMetError,
          "#{spec.full_name} requires RubyGems version #{rrgv}. The current RubyGems version is #{rg_version}. " \
          "Try 'gem update --system' to update RubyGems itself."
      end