Gem::BundlerVersionFinder.bundler_version_with_reason

# File tmp/rubies/ruby-3.0.5/lib/rubygems/bundler_version_finder.rb, line 12
def self.bundler_version_with_reason
  if v = ENV["BUNDLER_VERSION"]
    return [v, "`$BUNDLER_VERSION`"]
  end
  if v = bundle_update_bundler_version
    return if v == true
    return [v, "`bundle update --bundler`"]
  end
  v, lockfile = lockfile_version
  if v
    return [v, "your #{lockfile}"]
  end
end