class Bundler::RubyVersion

def self.system
  ruby_engine = RUBY_ENGINE.dup
  ruby_version = ENV.fetch("BUNDLER_SPEC_RUBY_VERSION") { RUBY_VERSION }.dup
  ruby_engine_version = RUBY_ENGINE_VERSION.dup
  patchlevel = RUBY_PATCHLEVEL.to_s
  @ruby_version ||= RubyVersion.new(ruby_version, patchlevel, ruby_engine, ruby_engine_version)
end