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: _content.rs
    path of file: ./repos/aws-sdk-rust/sdk/pinpointemail/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>An object that represents the content of the email, and optionally a character set specification.</p>
#[non_exhaustive]
#[derive(::std::clone::Clone, ::std::cmp::PartialEq, ::std::fmt::Debug)]
pub struct Content {
    /// <p>The content of the message itself.</p>
    pub data: ::std::string::String,
    /// <p>The character set fo
    
    pub fn build(self) -> ::std::result::Result<crate::types::Content, ::aws_smithy_types::error::operation::BuildError> {
        ::std::result::Result::Ok(crate::types::Content {
            data: self.data.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "data",
                    "data was not specified but it is required when building Content",
                )
            })?,
            charset: self.charset,
        })
    }