Gem::ConfigFile#rubygems_api_key=

# File tmp/rubies/ruby-4.1.0-preview1/lib/rubygems/config_file.rb, line 411
def rubygems_api_key=(api_key)
  if credential_store
    store = active_credential_store

    if api_key.to_s.empty?
      warn_unremoved_credential(CREDENTIAL_STORE_DEFAULT_ACCOUNT) if store&.available? && !store.delete(CREDENTIAL_STORE_DEFAULT_ACCOUNT)
    elsif store&.set(CREDENTIAL_STORE_DEFAULT_ACCOUNT, api_key)
      remove_api_key_from_file(:rubygems_api_key)
      @rubygems_api_key = api_key
      return
    else
      warn_unremoved_credential(CREDENTIAL_STORE_DEFAULT_ACCOUNT) if store&.available? && !store.delete(CREDENTIAL_STORE_DEFAULT_ACCOUNT)
      warn_credential_store_fallback
    end
  end

  set_api_key :rubygems_api_key, api_key

  @rubygems_api_key = api_key
end