https://github.com/servo/rust-smallvec/blob/feb3e45d29e3c6690812164ffc95aa1369de656d/lib.rs#L48-L49 https://github.com/servo/rust-smallvec/blob/feb3e45d29e3c6690812164ffc95aa1369de656d/lib.rs#L762 Seems like we might be able to replace this usage with [this](https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html): ```rust use std::hint; // ... unsafe { self.pop().unwrap_or_else(hint::unreachable_unchecked) }