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: _vpc_options.rs
    path of file: ./repos/aws-sdk-rust/sdk/osis/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>Options that specify the subnets and security groups for an OpenSearch Ingestion VPC endpoint.</p>
#[non_exhaustive]
#[derive(::std::clone::Clone, ::std::cmp::PartialEq, ::std::fmt::Debug)]
pub struct VpcOptions {
    /// <p>A list of subnet IDs associated with the VPC endpoint.</p>
    pub subnet_ids: ::std::vec::Vec<::std::string::String>,
    /// <p>A list of security groups as
    
    pub fn build(self) -> ::std::result::Result<crate::types::VpcOptions, ::aws_smithy_types::error::operation::BuildError> {
        ::std::result::Result::Ok(crate::types::VpcOptions {
            subnet_ids: self.subnet_ids.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "subnet_ids",
                    "subnet_ids was not specified but it is required when building VpcOptions",
                )
            })?,
            security_group_ids: self.security_group_ids,
        })
    }