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: ringlog.rs
    path of file: ./repos/wezterm/env-bootstrap/src
    
    the code of the file until where you have to start completion: //! This module sets up a logger that captures recent log entries
//! into an in-memory ring-buffer, as well as passed them on to
//! a pretty logger on stderr.
//! This allows other code to collect the ring buffer and display it
//! within the application.
use chrono::prelude::*;
use env_l
    
    fn push(&mut self, entry: Entry) {
        if self.len() == self.entries.len() {
            // We are full; effectively pop the first entry to
            // make room
            self.entries[self.first] = entry;
            self.first = self.rolling_inc(self.first);
        } else {
            self.entries[self.last] = entry;
        }
        self.last = self.rolling_inc(self.last);
    }