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: _deprecation_request_details.rs
    path of file: ./repos/aws-sdk-rust/sdk/dataexchange/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>Extra details specific to a deprecation type notification.</p>
#[non_exhaustive]
#[derive(::std::clone::Clone, ::std::cmp::PartialEq, ::std::fmt::Debug)]
pub struct DeprecationRequestDetails {
    /// <p>A datetime in the future when the data set will be deprecated.</p>
    pub deprecation_at: ::aws_smithy_types::DateTime,
}
impl DeprecationRequestDetails {
    /// <p>A datetime in the future when the data set will be depr
    
    pub fn build(self) -> ::std::result::Result<crate::types::DeprecationRequestDetails, ::aws_smithy_types::error::operation::BuildError> {
        ::std::result::Result::Ok(crate::types::DeprecationRequestDetails {
            deprecation_at: self.deprecation_at.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "deprecation_at",
                    "deprecation_at was not specified but it is required when building DeprecationRequestDetails",
                )
            })?,
        })
    }