> There are some APIs like this but last time I checked they didn’t cover all usecases. This refers to[1] <&mut [T]>::split_at_mut(usize) -> (&mut [T], &m

> There are some APIs like this but last time I checked they didn’t cover all usecases. This refers to[1] <&mut [T]>::split_at_mut(usize) -> (&mut [T], &mut [T])` used as let (first_42, rest) = mutable_slice.split_at_mut(42); but you can see that the inner logic is just a bit of pointer twiddling[2] let len = self.len(); let ptr = self.as_ptr(); // SAFETY: Caller has to check that `0 <= mid <= self.len()` unsafe { (from_raw_parts(ptr, mid), from_raw_parts(ptr.add(mid), len - mid)) } [1]: https://doc.rust-lang.org/std/primitive.slice.html#method.split_at_mut https://doc.rust-lang.org/std/primitive.slice.html#method.sp... [2]: https://doc.rust-lang.org/src/core/slice/mod.rs.html#1641-1645 https://doc.rust-lang.org/src/core/slice/mod.rs.html#1641-16...