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: _sender_id_and_country.rs
    path of file: ./repos/aws-sdk-rust/sdk/pinpointsmsvoicev2/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>The alphanumeric sender ID in a specific country that you want to describe. For more information on sender IDs see <a href="https://docs.aws.amazon.com/pinpoint/latest/userguide/channels-sms-awssupport-sender-id.html">Requesting sender IDs for SMS messaging with Amazon Pinpoint </a> in the <i>Amazon Pinpoint User Guide</i>.</p>
#[non_exhaustive]
#[derive(::std::clone::Clone, ::std::cmp::PartialEq, ::std::fmt::Debug)]
pub struct SenderIdAndCountry {
    /// <p>The unique identifier of the sender.</p>
    pub sender_id: ::std::string::String,
    /// <p>The two-character code, in ISO 3166-1 alpha-2 forma
    
    pub fn build(self) -> ::std::result::Result<crate::types::SenderIdAndCountry, ::aws_smithy_types::error::operation::BuildError> {
        ::std::result::Result::Ok(crate::types::SenderIdAndCountry {
            sender_id: self.sender_id.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "sender_id",
                    "sender_id was not specified but it is required when building SenderIdAndCountry",
                )
            })?,
            iso_country_code: self.iso_country_code.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "iso_country_code",
                    "iso_country_code was not specified but it is required when building SenderIdAndCountry",
                )
            })?,
        })
    }