Gem::Commands::UninstallCommand#uninstall_all

# File tmp/rubies/ruby-3.4.1/lib/rubygems/commands/uninstall_command.rb, line 140
def uninstall_all
  specs = Gem::Specification.reject(&: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