class Bundler::CLI::Gem

def validate_rust_builder_rubygems_version
  if Gem::Version.new(rust_builder_required_rubygems_version) > Gem.rubygems_version
    Bundler.ui.error "Your RubyGems version (#{Gem.rubygems_version}) is too old to build Rust extension. Please update your RubyGems using `gem update --system` or any other way and try again."
    exit 1
  end
end