#![allow(unused_variables)]
fn main() {
    use std::ffi::CString;
    let c_string = CString::from(c"foo");
    let ptr = c_string.into_raw();
    unsafe {
        assert_eq!(b'f', * ptr as u8);
        assert_eq!(b'o', * ptr.add(1) as u8);
        assert_eq!(b'o', * ptr.add(2) as u8);
        assert_eq!(b'\0', * ptr.add(3) as u8);
        let _ = CString::from_raw(ptr);
    }
}