#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn from_utf8_lossy<F>(mut input: &[u8], mut push: F)
where
    F: FnMut(&str),
{
    loop {
        match std::str::from_utf8(input) {
            Ok(valid) => {
                push(valid);
                break;
            }
            Err(error) => {
                let (valid, after_valid) = input.split_at(error.valid_up_to());
                unsafe { push(std::str::from_utf8_unchecked(valid)) }
                push("\u{FFFD}");
                if let Some(invalid_sequence_length) = error.error_len() {
                    input = &after_valid[invalid_sequence_length..]
                } else {
                    break
                }
            }
        }
    }
}
fn main() {}