class RuboCop::Cop::Rails::SaveBang

def allowed_receiver?(node)
  return false unless node.receiver
  return true if node.receiver.const_name == 'ENV'
  return false unless cop_config['AllowedReceivers']
  cop_config['AllowedReceivers'].any? do |allowed_receiver|
    receiver_chain_matches?(node, allowed_receiver)
  end
end