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/kanata/parser/src/keys
    
    the code of the file until where you have to start completion: //! Platform specific code for OS key code mappings.

use kanata_keyberon::key_code::*;
use once_cell::sync::Lazy;
use parking_lot::Mutex;
use rustc_hash::FxHashMap as HashMap;

#[cfg(any(target_os = "linux", target_os = "unknown"))]
mod linux;
#[cfg(any(target_os = "macos", target_os = "unknown"))]
mod macos;
#[cfg(any(target_
    
    pub fn as_u16(self) -> u16 {
        #[cfg(target_os = "unknown")]
        return match *OSCODE_MAPPING_VARIANT.lock() {
            Platform::Win => self.as_u16_windows(),
            Platform::Linux => self.as_u16_linux(),
            Platform::Macos => self.as_u16_macos(),
        };

        #[cfg(target_os = "linux")]
        return self.as_u16_linux();

        #[cfg(target_os = "windows")]
        return self.as_u16_windows();

        #[cfg(target_os = "macos")]
        return self.as_u16_macos();
    }