Gem::GemcutterUtilities#verify_api_key

# File tmp/rubies/ruby-4.0.0/lib/rubygems/gemcutter_utilities.rb, line 195
def verify_api_key(key)
  if Gem.configuration.api_keys.key? key
    Gem.configuration.api_keys[key]
  else
    alert_error "No such API key. Please add it to your configuration (done automatically on initial `gem push`)."
    terminate_interaction(ERROR_CODE)
  end
end