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_GetPolicyVersion.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/aws-sdk-go-v2/service/iam/types"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// Retrieves information about the specified version of the specified managed
// policy, including the policy document. Policies returned by this operation are
// URL-encoded compliant with RFC 3986 (https://tools.ietf.org/html/rfc3986) . You
// can use a URL decoding method to convert the policy back to plain JSON text. For
// example, if you use Java, you can use the decode method of the
// java.net.URLDecoder utility class in the Java SDK. Other languages and SDKs
// provide similar functionality. To list the available versions for a policy, use
// ListPolicyVersions . This operation retrieves information about managed
// policies. To retrieve information about an inline policy that is embedded in a
// user, group, or role, use GetUserPolicy , GetGroupPolicy , or GetRolePolicy .
// For more information about the types of policies, see Managed policies and
// inline policies (https://docs.aws.amazon.com/IAM/latest/UserGuide/policies-managed-vs-inline.html)
// in the IAM User Guide. For more information about managed policy versions, see
// Versioning for managed policies (https://docs.aws.amazon.com/IAM/latest/UserGuide/policies-managed-versions.html)
// in the IAM User Guide.
func (c *Client) GetPolicyVersion(ctx context.Context, params *GetPolicyVersionInput, optFns ...func(*Options)) (*GetPolicyVersionOutput, error) {
	if params == nil {
		params = &GetPolicyVersionInput{}
	}

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

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

type GetPolicyVersionInput struct {

	// The Amazon Resource Name (ARN) of the managed policy that you want information
	// about. For more information about ARNs, see Amazon Resource Names (ARNs) (https://docs.a
    
func (c *Client) addOperationGetPolicyVersionMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsAwsquery_serializeOpGetPolicyVersion{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsquery_deserializeOpGetPolicyVersion{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "GetPolicyVersion"); 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 = addOpGetPolicyVersionValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opGetPolicyVersion(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
}