#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::ffi::{c_char, CStr};
const HELLO_PTR: *const c_char = {
    const BYTES: &[u8] = b"Hello, world!\0";
    BYTES.as_ptr().cast()
};
const HELLO: &CStr = unsafe { CStr::from_ptr(HELLO_PTR) };
fn main() {
    assert_eq!(c"Hello, world!", HELLO);
}