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

require_relative "deprecate"

##
# The Version class proces
    
  def self.create(input)
    if self === input # check yourself before you wreck yourself
      input
    elsif input.nil?
      nil_versions_are_discouraged!

      nil
    else
      new input
    end