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: waiters.go
    path of file: ./repos/tegola/vendor/github.com/aws/aws-sdk-go/service/s3
    
    the code of the file until where you have to start completion: // Code generated by private/model/cli/gen-api/main.go. DO NOT EDIT.

package s3

import (
	"time"

	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/aws/request"
)

// WaitUntilBucketExists uses the Amazon S3 API operation
// HeadBucket to wait for a condition to be met before returning.
// If the condition is not met within the max attempt window, an error will
// be returned.
func (c *S3) WaitUntilBucketExists(input *HeadBucketInput) error {
	return c.WaitUntilBucketExistsWithContext(aws.BackgroundContext(), input)
}

// WaitUntilBucketE
    
func (c *S3) WaitUntilObjectNotExistsWithContext(ctx aws.Context, input *HeadObjectInput, opts ...request.WaiterOption) error {
	w := request.Waiter{
		Name:        "WaitUntilObjectNotExists",
		MaxAttempts: 20,
		Delay:       request.ConstantWaiterDelay(5 * time.Second),
		Acceptors: []request.WaiterAcceptor{
			{
				State:    request.SuccessWaiterState,
				Matcher:  request.StatusWaiterMatch,
				Expected: 404,
			},
		},
		Logger: c.Config.Logger,
		NewRequest: func(opts []request.Option) (*request.Request, error) {
			var inCpy *HeadObjectInput
			if input != nil {
				tmp := *input
				inCpy = &tmp
			}
			req, _ := c.HeadObjectRequest(inCpy)
			req.SetContext(ctx)
			req.ApplyOptions(opts...)
			return req, nil
		},
	}
	w.ApplyOptions(opts...)

	return w.WaitWithContext(ctx)
}