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

package iam

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

// Updates the policy that grants an IAM entity permission to assume a role. This
// is typically referred to as the "role trust policy". For more information about
// roles, see Using roles to delegate permissions and federate identities (https://docs.aws.amazon.com/IAM/latest/UserGuide/roles-toplevel.html)
// .
func (c *Client) UpdateAssumeRolePolicy(ctx context.Context, params *UpdateAssumeRolePolicyInput, optFns ...func(*Options)) (*UpdateAssumeRolePolicyOutput, error) {
	if params == nil {
		params = &UpdateAssumeRolePolicyInput{}
	}

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

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

type UpdateAssumeRolePolicyInput struct {

	// The policy that grants an entity permission to assume the role. You must
	// provide policies in JSON format in IAM. However, for CloudFormation templates
	// formatted in YAML, you can provide the policy in JSON or YAML format.
	// CloudFormation always converts a YAML policy to JSON format before submitting it
	// to IAM. The regex pattern (http://wikipedia.org/wiki/regex) used to validate
	// this parameter is a string of characters consisting of the following:
	//   - Any printable ASCII character ranging from the space character ( \u0020 )
	//   through the end of the ASCII character range
	//   - The printable characters in the Basic Latin and Latin-1 Supplement
	//   character set (through \u00FF )
	//   - The special characters tab ( \u0009 ), line feed ( \u000A ), and carriage
	//   return ( \u000D )
	//
	// This member is required.
	PolicyDocument *string

	// The name of the role to update with the new policy. This parameter allows
	// (through its regex pattern (http://wikipedia.org/wiki/regex) ) a string of
	// characters consisting of upper and lowercase alphanu
    
func (c *Client) addOperationUpdateAssumeRolePolicyMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsAwsquery_serializeOpUpdateAssumeRolePolicy{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsquery_deserializeOpUpdateAssumeRolePolicy{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "UpdateAssumeRolePolicy"); 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 = addOpUpdateAssumeRolePolicyValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opUpdateAssumeRolePolicy(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
}