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: main.rs
    path of file: ./repos/kerla/kernel
    
    the code of the file until where you have to start completion: #![no_std]
#![no_main]
#![feat
    
    fn usercopy_hook(&self) {
        use crate::process::current_process;

        // We should not hold the vm lock since we'll try to acquire it in the
        // page fault handler when copying caused a page fault.
        debug_assert!(!current_process().vm().as_ref().unwrap().is_locked());
    }