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: _get_digest_output.rs
    path of file: ./repos/aws-sdk-rust/sdk/qldb/src/operation/get_digest
    
    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.
#[allow(missing_docs)] // documentation missing in model
#[non_exhaustive]
#[derive(::std::clone::Clone, ::std::cmp::PartialEq)]
pub struct GetDigestOutput {
    /// <p>The 256-bit hash value representing the digest returned by a <code>GetDigest</code> request.</p>
    pub digest: ::aws_smithy_types::Blob,
    /// <p>The latest block location covered by the digest that you requested. An address is an Amazon Ion structure that has two f
    
    pub fn build(self) -> ::std::result::Result<crate::operation::get_digest::GetDigestOutput, ::aws_smithy_types::error::operation::BuildError> {
        ::std::result::Result::Ok(crate::operation::get_digest::GetDigestOutput {
            digest: self.digest.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "digest",
                    "digest was not specified but it is required when building GetDigestOutput",
                )
            })?,
            digest_tip_address: self.digest_tip_address,
            _request_id: self._request_id,
        })
    }