concat_ruby_version_requirements

# File lib/bundler/definition.rb, line 864
    def concat_ruby_version_requirements(ruby_version, ruby_versions = [])
      return ruby_versions unless ruby_version
      if ruby_version.patchlevel
        ruby_versions << ruby_version.to_gem_version_with_patchlevel
      else
        ruby_versions.concat(ruby_version.versions.map do |version|
          requirement = Gem::Requirement.new(version)
          if requirement.exact?
            "~> #{version}.0"
          else
            requirement
          end
        end)
      end
    end