I think it is important to note that in 59nadir's example, the reason Rust gives an error and Odin doesn't is not memory safety. Rust uses move semantics by default in a loop while Odin appears to use copy semantics by default. I don't really know Odin, but it seems like it is a language that doesn't have RAII. In which case, copy semantics are fine for Odin, but in Rust they could result in a lot of extra allocations if your vector was holding RAII heap allocating objects. Obviously that means you would need to be careful about how to use pointers in Odin, but the choice of moving or copying by default for a loop has nothing to do with this. For reference:

Odin (from documentation):

  for x in some_array { // copy semantics
  for &x in some_array { // reference semantics
  // no move semantics? (could be wrong on this)

Rust:

  for x in vec.iter_ref().copied() { // bytewise copy semantics (only for POD types)
  for x in vec.iter_ref().cloned() { // RAII copy semantics
  for x in &vec { // reference semantics
  for x in vec { // move semantics

C++:

  for (auto x : vec) { // copy semantics
  for (auto &x : vec) { // reference semantics
  for (auto &&x : vec) { // move semantics