#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::ffi::{c_char, CStr};
fn my_string() -> *const c_char {
    c"hello".as_ptr()
}
fn main() {
    unsafe {
        let slice = CStr::from_ptr(my_string());
        assert_eq!(slice.to_str().unwrap(), "hello");
    }
}