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_sol_function_package_metadata.rs
    path of file: ./repos/aws-sdk-rust/sdk/tnb/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>Metadata related to the function package.</p>
/// <p>A function package is a .zip file in CSAR (Cloud Service Archive) format that contains a network function (an ETSI standard telecommunication application) and function package descriptor that uses the TOSCA standard to describe how the network functions should run on your network.</p>
#[non_exhaustive]
#[derive(::std::clone::Clone, ::std::cmp::PartialEq, ::std::fmt::Debug)]
pub struct GetSolFunctionPackageMetadata {
    /// <p>Metadata related to the function package descriptor of the funct
    
    pub fn build(self) -> ::std::result::Result<crate::types::GetSolFunctionPackageMetadata, ::aws_smithy_types::error::operation::BuildError> {
        ::std::result::Result::Ok(crate::types::GetSolFunctionPackageMetadata {
            vnfd: self.vnfd,
            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 GetSolFunctionPackageMetadata",
                )
            })?,
            last_modified: self.last_modified.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "last_modified",
                    "last_modified was not specified but it is required when building GetSolFunctionPackageMetadata",
                )
            })?,
        })
    }