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: _start_recovery_request_source_server.rs
    path of file: ./repos/aws-sdk-rust/sdk/drs/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 object representing the Source Server to recover.</p>
#[non_exhaustive]
#[derive(::std::clone::Clone, ::std::cmp::PartialEq, ::std::fmt::Debug)]
pub struct StartRecoveryRequestSourceServer {
    /// <p>The ID of the Source Server you want to recover.</p>
    pub source_server_id: ::std::string::String,
    /// <p>The ID of a Recovery Snapshot we want to recover from. Omit this field to launch from the latest data by taking an on-demand snapshot.</p
    
    pub fn build(self) -> ::std::result::Result<crate::types::StartRecoveryRequestSourceServer, ::aws_smithy_types::error::operation::BuildError> {
        ::std::result::Result::Ok(crate::types::StartRecoveryRequestSourceServer {
            source_server_id: self.source_server_id.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "source_server_id",
                    "source_server_id was not specified but it is required when building StartRecoveryRequestSourceServer",
                )
            })?,
            recovery_snapshot_id: self.recovery_snapshot_id,
        })
    }