Gem::Commands::UninstallCommand#uninstall_all

# File tmp/rubies/ruby-3.1.3/lib/rubygems/commands/uninstall_command.rb, line 137
def uninstall_all
  specs = Gem::Specification.reject {|spec| spec.default_gem? }

  specs.each do |spec|
    options[:version] = spec.version
    uninstall_gem spec.name
  end

  alert "Uninstalled all gems in #{options[:install_dir] || Gem.dir}"
end