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: string_weight.rs
    path of file: ./repos/rustfst/rustfst/src/semirings
    
    the code of the file until where you have to start completion: use std::borrow::Borrow;
use std::fmt;
use std::io::Write;

use anyhow::Result;
use nom::branch::alt;
use nom::bytes::complete::tag;
use
    
    fn divide_assign(&mut self, rhs: &Self, divide_type: DivideType) -> Result<()> {
        if divide_type != DivideType::DivideLeft {
            bail!("Only left division is defined.");
        }
        self.value = divide_left(&self.value, &rhs.value);
        Ok(())
    }