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: _pod_identity_association.rs
    path of file: ./repos/aws-sdk-rust/sdk/eksauth/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>Amazon EKS Pod Identity associations provide the ability to manage credentials for your applications, similar to the way that Amazon EC2 instance profiles provide credentials to Amazon EC2 instances.</p>
#[non_exhaustive]
#[derive(::std::clone::Clone, ::std::cmp::PartialEq, ::std::fmt::Debug)]
pub struct PodIdentityAssociation {
    /// <p>The Amazon Resource Name (ARN) of the EKS Pod Identity association.</p>
    pub association_arn: ::std::string::String,
    /// <p>The ID of the association.</p>
    pub association_id: ::std::string::String,
}
impl PodIdentityAssociation {
    /// <p>The Amazon Resource Name (ARN) of the EKS Pod
    
    pub fn build(self) -> ::std::result::Result<crate::types::PodIdentityAssociation, ::aws_smithy_types::error::operation::BuildError> {
        ::std::result::Result::Ok(crate::types::PodIdentityAssociation {
            association_arn: self.association_arn.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "association_arn",
                    "association_arn was not specified but it is required when building PodIdentityAssociation",
                )
            })?,
            association_id: self.association_id.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "association_id",
                    "association_id was not specified but it is required when building PodIdentityAssociation",
                )
            })?,
        })
    }