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: test.rs
    path of file: ./repos/glad/test/rust/run/gl/default/001
    
    the code of the file until where you have to start completion: #![deny(warnings)]
/**
 * Full core GL, should compile
 *
 * GLAD: $GLAD --out-path=$tmp --api="gl:core=" rust
 * COMPILE: cp -r $test_dir/. $tmp && cd $tmp && cargo build
 * RUN: cargo run
 */
extern crate glad_gl;
extern crate glfw;

use glad_gl::gl;
use 
    
fn main() {
    let mut glfw = glfw::init(glfw::LOG_ERRORS).unwrap();

    let (mut window, _events) =
        glfw.create_window(300, 300, "[glad] Rust - OpenGL with GLFW", glfw::WindowMode::Windowed)
            .expect("Failed to create GLFW window.");

    window.set_key_polling(true);
    window.make_current();

    gl::load(|e| glfw.get_proc_address_raw(e) as *const std::os::raw::c_void);

    glfw.poll_events();

    unsafe {
        gl::Viewport(0, 0, 300, 300);
        gl::ClearColor(0.7, 0.9, 0.1, 1.0);
        gl::Clear(gl::COLOR_BUFFER_BIT);
    }

    window.swap_buffers();
}