I tried this code (playground):

unsafe fn f() {
    None.unwrap_or(String::new().as_mut_vec());
}

fn g() {
    None.unwrap_or(unsafe { String::new().as_mut_vec() });
}

I expected to see this happen: Clippy warns on both f and g.

Instead, this happened: Clippy only warns on f.

Meta

• cargo clippy -V: 0.1.51 (2021-02-03 e708cbd)