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: _trusted_signers.rs
    path of file: ./repos/aws-sdk-rust/sdk/cloudfront/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 Amazon Web Services accounts whose public keys CloudFront can use to verify the signatures of signed URLs and signed cookies.</p>
#[non_exhaustive]
#[derive(::std::clone::Clone, ::std::cmp::PartialEq, ::std::fmt::Debug)]
pub struct TrustedSigners {
    /// <p>This field is <code>true</code> if any of the Amazon Web Services accounts in the list are configured as trusted signers. If not, this field is <code>false</code>.</p>
    pub enabled: bool,
    /// <p>The number of Amazon Web Services accounts in the list.</p>
 
    
    pub fn build(self) -> ::std::result::Result<crate::types::TrustedSigners, ::aws_smithy_types::error::operation::BuildError> {
        ::std::result::Result::Ok(crate::types::TrustedSigners {
            enabled: self.enabled.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "enabled",
                    "enabled was not specified but it is required when building TrustedSigners",
                )
            })?,
            quantity: self.quantity.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "quantity",
                    "quantity was not specified but it is required when building TrustedSigners",
                )
            })?,
            items: self.items,
        })
    }