[afdbcreid]

No it will not:

    fn requires_static(_: &'static str) {}
    
    let long_lifetime: &'static str = "";
    let closure = |_input: &str| -> &str { long_lifetime };
    let short_lifetime = &String::new();
    requires_static(closure(short_lifetime));

This code compiles currently as the returned `&str` is inferred to be `&'static str` because this is what it actually returns, but with #10 fixed it will not because lifetime elision rules say that the lifetime of the output is the same as the lifetime of the input.

[brabel]

Hm, in this case it's actually nice that this works because there's nothing unsafe or unexpected going on.