You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: consumer.go
    path of file: ./repos/eagle/pkg/queue/rabbitmq/options
    
    the code of the file until where you have to start completion: package options

type ConsumerOption func(*ConsumerOptions)

type ConsumerOptions struct {
	Concurrency int

	QOSPrefetchCount int
	QOSPrefet
    
func NewConsumerOptions(opts ...ConsumerOption) *ConsumerOptions {
	// set default value
	options := ConsumerOptions{
		Concurrency:      1,
		QOSPrefetchCount: 5,
	}

	// apply options
	for _, opt := range opts {
		opt(&options)
	}
	return &options
}