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: mod.rs
    path of file: ./repos/rx/src/platform
    
    the code of the file until where you have to start completion: #![allow(dead_code)]
use std::io;

use std::fmt;

#[cfg(not(feature = "glfw"))]
#[path = "dummy.rs"]
pub mod backend;

#[cfg(feature = "glfw")]
#[path = "glfw.rs"]
pub mod backend;

/// Initialize the platform.
pub fn init(
    title: &str,
    w: u32,
    h: u32,
    hints: &[WindowHint],
    context: GraphicsContext,
) -> io::Result<(backend::Window, backend::Events)> {
    backend::init(title, w, h, hints, context)
}

#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum GraphicsContext {
    None,
    Gl,
}

#[derive(Debug, Copy, Clone)]
pub enum WindowHint {
    Resizable(bool),
    Visible(bool),
}

/// Describes an event from a `Window`.
#[derive(Clone, Debug, PartialEq)]
pub enum WindowEvent {
    /// The size of the window has changed. Contains the client area's new dimensions.
    Resized(LogicalSize),

    /// The position of the window has changed. Contains the window's new position.
    Moved(LogicalPosition),

    /// The window was minimized.
    Minimized,

    /// The window was restored after having been minimized.
    Restored,

    /// The window has been requested to close.
    CloseRequested,

    /// The window has been destroyed.
    Destroyed,

    /// The window received a unicode character.
    ReceivedCharacter(char, ModifiersState),

    /// The window gained or lost focus.
    Focused(bool),

    /// An event from the keyboard 
    
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Key::A => "a".fmt(f),
            Key::B => "b".fmt(f),
            Key::C => "c".fmt(f),
            Key::D => "d".fmt(f),
            Key::E => "e".fmt(f),
            Key::F => "f".fmt(f),
            Key::G => "g".fmt(f),
            Key::H => "h".fmt(f),
            Key::I => "i".fmt(f),
            Key::J => "j".fmt(f),
            Key::K => "k".fmt(f),
            Key::L => "l".fmt(f),
            Key::M => "m".fmt(f),
            Key::N => "n".fmt(f),
            Key::O => "o".fmt(f),
            Key::P => "p".fmt(f),
            Key::Q => "q".fmt(f),
            Key::R => "r".fmt(f),
            Key::S => "s".fmt(f),
            Key::T => "t".fmt(f),
            Key::U => "u".fmt(f),
            Key::V => "v".fmt(f),
            Key::W => "w".fmt(f),
            Key::X => "x".fmt(f),
            Key::Y => "y".fmt(f),
            Key::Z => "z".fmt(f),
            Key::Num0 => "0".fmt(f),
            Key::Num1 => "1".fmt(f),
            Key::Num2 => "2".fmt(f),
            Key::Num3 => "3".fmt(f),
            Key::Num4 => "4".fmt(f),
            Key::Num5 => "5".fmt(f),
            Key::Num6 => "6".fmt(f),
            Key::Num7 => "7".fmt(f),
            Key::Num8 => "8".fmt(f),
            Key::Num9 => "9".fmt(f),
            Key::LBracket => "[".fmt(f),
            Key::RBracket => "]".fmt(f),
            Key::Comma => ",".fmt(f),
            Key::Period => ".".fmt(f),
            Key::Slash => "/".fmt(f),
            Key::Backslash => "\\".fmt(f),
            Key::Apostrophe => "'".fmt(f),
            Key::Control => "<ctrl>".fmt(f),
            Key::Shift => "<shift>".fmt(f),
            Key::Alt => "<alt>".fmt(f),
            Key::Up => "<up>".fmt(f),
            Key::Down => "<down>".fmt(f),
            Key::Left => "<left>".fmt(f),
            Key::Right => "<right>".fmt(f),
            Key::Return => "<return>".fmt(f),
            Key::Backspace => "<backspace>".fmt(f),
            Key::Space => "<space>".fmt(f),
            Key::Tab => "<tab>".fmt(f),
            Key::Escape => "<esc>".fmt(f),
            Key::Insert => "<insert>".fmt(f),
            Key::Delete => "<delete>".fmt(f),
            Key::Home => "<home>".fmt(f),
            Key::PageUp => "<pgup>".fmt(f),
            Key::PageDown => "<pgdown>".fmt(f),
            Key::Grave => "`".fmt(f),
            Key::Caret => "^".fmt(f),
            Key::End => "<end>".fmt(f),
            Key::Colon => ":".fmt(f),
            Key::Semicolon => ";".fmt(f),
            Key::Equal => "=".fmt(f),
            Key::Minus => "-".fmt(f),
            _ => "???".fmt(f),
        }
    }