#![allow(unused_variables)]
fn main() {
    use std::ffi::{CString, FromVecWithNulError};
    let _: FromVecWithNulError = CString::from_vec_with_nul(b"a\0bc".to_vec())
        .unwrap_err();
    let _: FromVecWithNulError = CString::from_vec_with_nul(b"abc".to_vec())
        .unwrap_err();
}