fn push_fn_err(s :&str)->String{
    s.to_string().push_str("new_chunk");
    s.to_string()
}
fn push_str_expect(s:&str)->String{
    let mut output = s.to_string();
    output.push_str("new_chunk");
    output.to_string()
}
fn main() {
   assert_eq!(push_fn_err(""),push_str_expect("")) ;
}

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