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: platform.rs
    path of file: ./repos/heim/heim-host/src/sys/windows
    
    the code of the file until where you have to start completion: use std::fmt;
use std::mem;

use nt
    
    pub fn system(&self) -> &str {
        match self.version.wProductType {
            winnt::VER_NT_WORKSTATION => "Windows",
            winnt::VER_NT_SERVER => "Windows Server",
            winnt::VER_NT_DOMAIN_CONTROLLER => "Windows Domain Controller",
            other => unreachable!("Unknown Windows product type: {}", other),
        }
    }