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: error_types.rs
    path of file: ./repos/rusoto/service_crategen/src/commands/generate/codegen
    
    the code of the file until where you have to start completion: use std::collections::BTreeMap;
use std::io::Write;

use super::{error_type_name, FileWriter, IoResult};
use crate::botocore::Operation;
use crate::Service;

/// Examines the error types described in the 
    
                    pub fn from_response(res: BufferedHttpResponse) -> RusotoError<{type_name}> {{
                        {{
                            let reader = EventReader::new(res.body.as_ref());
                            let mut stack = XmlResponse::new(reader.into_iter().peekable());
                            find_start_element(&mut stack);
                            if let Ok(parsed_error) = Self::deserialize(&mut stack) {{
                                match &parsed_error.code[..] {{
                                    {type_matchers}
                                }}
                           }}
                       }}
                       RusotoError::Unknown(res)
                    }}

                    fn deserialize<T>(stack: &mut T) -> Result<XmlError, XmlParseError> where T: Peek + Next {{
                        {error_deserializer}
                    }}
                }}",
                type_name = error_type_name(service, operation_name),
                error_deserializer = self.generate_error_deserializer(service),
                type_matchers = self.generate_error_type_matchers(operation_name, operation, service))
    }
}

impl XmlErrorTypes {
    fn generate_error_deserializer(&self, service: &Service<'_>) -> String {
        if service.service_id() == Some("EC2") {