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: shrobt.rs
    path of file: ./repos/rdms/src/_archive
    
    the code of the file until where you have to start completion: //! Module `shrobt` implement an ordered set of index using Robt shards.

use log::{debug, error};
use toml;

use std::{
    borrow::Borrow,
    cmp,
    
    
    fn validate(&mut self) -> Result<robt::Stats> {
        let mut shards = self.as_shards()?;

        let mut stats: robt::Stats = Default::default();

        for shard in shards.iter_mut() {
            stats = stats.merge(shard.to_snapshot()?.validate()?)
        }

        Ok(stats)
    }