#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn from_utf8_lossy<F>(input: &[u8], mut push: F)
where
    F: FnMut(&str),
{
    for chunk in input.utf8_chunks() {
        push(chunk.valid());
        if !chunk.invalid().is_empty() {
            push("\u{FFFD}");
        }
    }
}
fn main() {}