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: _liveness_output_config.rs
    path of file: ./repos/aws-sdk-rust/sdk/rekognition/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>Contains settings that specify the location of an Amazon S3 bucket used to store the output of a Face Liveness session. Note that the S3 bucket must be located in the calle
    
    pub fn build(self) -> ::std::result::Result<crate::types::LivenessOutputConfig, ::aws_smithy_types::error::operation::BuildError> {
        ::std::result::Result::Ok(crate::types::LivenessOutputConfig {
            s3_bucket: self.s3_bucket.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "s3_bucket",
                    "s3_bucket was not specified but it is required when building LivenessOutputConfig",
                )
            })?,
            s3_key_prefix: self.s3_key_prefix,
        })
    }