Thankfully the way errors get generated appeared to be fixed in 1.70.0-beta

infinite_ampersand.rs

// Compare between
// https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=74eaa1906a58b5daad47c210241143a6
// and
// https://play.rust-lang.org/?version=beta&mode=debug&edition=2021&gist=74eaa1906a58b5daad47c210241143a6

struct Thing(String);
struct View<'a>(&'a str);

impl<'a> From<&'a Thing> for View<'a>
{
    fn from(value: &'a Thing) -> Self {
        Self(&value.0[value.0.find('@').unwrap_or(0)..])
    }
}

fn lookat_view(view: &View) {
    println!("looking at view: {}", view.0);
}

fn discard_view(view: View) {
    println!("view discarded: {}", view.0);
}

fn main() {
    let thing = Thing("thing@somewhere".to_string());

    // correct invocation
    lookat_view(&(&thing).into());
    discard_view((&thing).into());

    // incorrect invocation
    discard_view(thing.into());
    discard_view(&thing.into());

    lookat_view(&thing.into());
    lookat_view(&&thing.into());
}