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: _replication_destination.rs
    path of file: ./repos/aws-sdk-rust/sdk/ecr/src/types
    
    the code of the file until where you have to start completion: // Code generated by software.amazon.smithy.rust.codegen.smithy-rs. DO NOT EDIT.

/// <p>An array of objects representing the destination for a replication rule.</p>
#[non_exhaustive]
#[derive(::std::clone::Clone, ::std::cmp::PartialEq, ::std::fmt::Debug)]
pub struct ReplicationDestination {
    /// <p>The Region to replicate to.</p>
    pub region: ::std::string::Str
    
    pub fn build(self) -> ::std::result::Result<crate::types::ReplicationDestination, ::aws_smithy_types::error::operation::BuildError> {
        ::std::result::Result::Ok(crate::types::ReplicationDestination {
            region: self.region.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "region",
                    "region was not specified but it is required when building ReplicationDestination",
                )
            })?,
            registry_id: self.registry_id.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "registry_id",
                    "registry_id was not specified but it is required when building ReplicationDestination",
                )
            })?,
        })
    }