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: lib.rs
    path of file: ./repos/rust-unic/unic/char/range/src
    
    the code of the file until where you have to start completion: // Copyright 2017 The UNIC Project Developers.
//
// See th
    
//! # fn main() {
//! for character in chars!('a'..='z') {
//!     // character is each character in the lowercase english alphabet in order
//! }
//!
//! for character in chars!(..) {
//!     // character is every valid char from lowest codepoint to highest
//! }
//! # }