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: _id_mapping_workflow_summary.rs
    path of file: ./repos/aws-sdk-rust/sdk/entityresolution/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>A list of <code>IdMappingWorkflowSummary</code> objects, each of which contain the fields <code>WorkflowName</code>, <code>WorkflowArn</code>, <code>CreatedAt</code>, and <code>UpdatedAt</code>.</p>
#[non_exhaustive]
#[derive(::std::clone::Clone, ::std::cmp::PartialEq, ::std::fmt::Debug)]
pub struct IdMappingWorkflowSummary {
    /// <p>The name of the workflow.</p>
    pub workflow_name: ::std::string::String,
    /// <p>The ARN (Amazon Resource Name) that Entity Resolution generated for the <code>IdMappingWorkflow</code>.</p>
    pub workflow_arn: ::std::string::String,
    /// <p>The timestamp of when the workflow was created.</p>
    pub created_at: ::aws_smithy_types::DateTime,
    /// <p>The timestamp of when the workflow was last updated.</p>
    pub updated_at: ::aws_smithy_types::DateTime,
}
impl IdMappingWorkflowSummary {
    /// <p>The name of the workflow.</p>
    pub fn workflow_name(&self) -> &str {
        use std::ops::Deref;
        self.workflow_name.deref()
    }
    /// <p>The ARN (Amazon Resource Name) that Entity Resolution generated for the <code>IdMappingWorkflow</code>.</p>
    pub fn workflow_arn(&self) -> &str {
        use std::ops::Deref;
        self.workflow_arn.deref()
    }
    /// <p>The timestamp of when the workflow was created.</p>
    pub fn created_at(&self) -> &::aws_smithy_types::DateTime {
        &self.created_
    
    pub fn build(self) -> ::std::result::Result<crate::types::IdMappingWorkflowSummary, ::aws_smithy_types::error::operation::BuildError> {
        ::std::result::Result::Ok(crate::types::IdMappingWorkflowSummary {
            workflow_name: self.workflow_name.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "workflow_name",
                    "workflow_name was not specified but it is required when building IdMappingWorkflowSummary",
                )
            })?,
            workflow_arn: self.workflow_arn.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "workflow_arn",
                    "workflow_arn was not specified but it is required when building IdMappingWorkflowSummary",
                )
            })?,
            created_at: self.created_at.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "created_at",
                    "created_at was not specified but it is required when building IdMappingWorkflowSummary",
                )
            })?,
            updated_at: self.updated_at.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "updated_at",
                    "updated_at was not specified but it is required when building IdMappingWorkflowSummary",
                )
            })?,
        })
    }