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: api_op_ListUsersInGroup.go
    path of file: ./repos/aws-sdk-go-v2/service/cognitoidentityprovider
    
    the code of the file until where you have to start completion: // Code generated by smithy-go-codegen DO NOT EDIT.

package cognitoidentityprovider

import (
	"context"
	"fmt"
	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// Lists the users in the specified group. Amazon Cognito evaluates Identity and
// Access Management (IAM) policies in requests for this API operation. For this
// operation, you must use IAM credentials to authorize requests, and you must
// grant yourself the corresponding IAM permission in a policy. Learn more
//   - Signing Amazon Web Services API Requests (https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_aws-signing.html)
//   - Using the Amazon Cognito user pools API and user pool endpoints (https://docs.aws.amazon.com/cognito/latest/developerguide/user-pools-API-operations.html)
func (c *Client) ListUsersInGroup(ctx context.Context, params *ListUsersInGroupInput, optFns ...func(*Options)) (*ListUsersInGroupOutput, error) {
	if params == nil {
		params = &ListUsersInGroupInput{}
	}

	result, metadata, err := c.invokeOperation(ctx, "ListUsersInGroup", params, optFns, c.addOperationListUsersInGroupMiddlewares)
	if err != nil {
		return nil, err
	}

	out := result.(*ListUsersInGroupOutput)
	out.ResultMetadata = metadata
	return out, nil
}

type ListUsersInGroupInput struct {

	// The name of the group.
	//
	// This member is required.
	GroupName *string

	// The user pool ID for the user pool.
	//
	// This member is required.
	UserPoolId *string

	// The maximum number of users that you want to retrieve before pagination.
	Limit *int32

	// An identifier that was returned from the previous call to this operation, which
	// can be used to return the next set of items in the list.
	NextToken *string

	noSmithyDocumentSerde
}

type ListUsersInGroupOutput struct {

	// An identifier that you can use in a later request to return the
    
func (c *Client) addOperationListUsersInGroupMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsAwsjson11_serializeOpListUsersInGroup{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpListUsersInGroup{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "ListUsersInGroup"); err != nil {
		return fmt.Errorf("add protocol finalizers: %v", err)
	}

	if err = addlegacyEndpointContextSetter(stack, options); err != nil {
		return err
	}
	if err = addSetLoggerMiddleware(stack, options); err != nil {
		return err
	}
	if err = addClientRequestID(stack); err != nil {
		return err
	}
	if err = addComputeContentLength(stack); err != nil {
		return err
	}
	if err = addResolveEndpointMiddleware(stack, options); err != nil {
		return err
	}
	if err = addComputePayloadSHA256(stack); err != nil {
		return err
	}
	if err = addRetry(stack, options); err != nil {
		return err
	}
	if err = addRawResponseToMetadata(stack); err != nil {
		return err
	}
	if err = addRecordResponseTiming(stack); err != nil {
		return err
	}
	if err = addClientUserAgent(stack, options); err != nil {
		return err
	}
	if err = smithyhttp.AddErrorCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = addSetLegacyContextSigningOptionsMiddleware(stack); err != nil {
		return err
	}
	if err = addOpListUsersInGroupValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opListUsersInGroup(options.Region), middleware.Before); err != nil {
		return err
	}
	if err = addRecursionDetection(stack); err != nil {
		return err
	}
	if err = addRequestIDRetrieverMiddleware(stack); err != nil {
		return err
	}
	if err = addResponseErrorMiddleware(stack); err != nil {
		return err
	}
	if err = addRequestResponseLogging(stack, options); err != nil {
		return err
	}
	if err = addDisableHTTPSMiddleware(stack, options); err != nil {
		return err
	}
	return nil
}