I think Steve might have forgotten (so many helper functions...), but Rust's slices have a `copy_within`[1] function for exactly this scenario: fn main() {

I think Steve might have forgotten (so many helper functions...), but Rust's slices have a `copy_within`[1] function for exactly this scenario: fn main() { let mut buf: [u8; 16] = *b"D04GOKUD09OVER90"; buf.copy_within(7..16, 0); println!("{:?}", buf); } It does only support types that are trivially copyable, but it's implemented exactly you'd expect: bounds checking then memcopy handling overlap. [1] https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within https://doc.rust-lang.org/std/primitive.slice.html#method.co...