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: _put_geofence_output.rs
    path of file: ./repos/aws-sdk-rust/sdk/location/src/operation/put_geofence
    
    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, ::std::fmt::Debug)]
pub struct PutGeofenceOutput {
    /// <p>The geofence identifier entered in the request.</p>
    pub geofence_id: ::std::string::String,
    /// <p>The timestamp for when the geofence was created in <a href="https://www.iso.org/iso-8601-date-and-time-format.html">ISO 8601</a> format: <code>YYYY-MM-DDThh:mm:ss.sssZ</code></p>
    pub create_time: ::aws_smithy_types::DateTime,
    /// <p>The timestamp for when the geofence was last updated in <a href="https://www.iso.org/iso-8601-date-and-time-format.html">ISO 8601</a> format: <code>YYYY-MM-DDThh:mm:ss.sssZ</code></p>
    pub update_time: ::aws_smithy_types::Da
    
    pub fn build(self) -> ::std::result::Result<crate::operation::put_geofence::PutGeofenceOutput, ::aws_smithy_types::error::operation::BuildError> {
        ::std::result::Result::Ok(crate::operation::put_geofence::PutGeofenceOutput {
            geofence_id: self.geofence_id.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "geofence_id",
                    "geofence_id was not specified but it is required when building PutGeofenceOutput",
                )
            })?,
            create_time: self.create_time.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "create_time",
                    "create_time was not specified but it is required when building PutGeofenceOutput",
                )
            })?,
            update_time: self.update_time.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "update_time",
                    "update_time was not specified but it is required when building PutGeofenceOutput",
                )
            })?,
            _request_id: self._request_id,
        })
    }