> For example any mildly complex loop that involves pointer juggling can benefit.

I'd say that when you're writing a mildly complex loop that involves pointer juggling, one should prefer to be defensive and explicit rather than cleverly trying to compress everything into one-liners.

> So then I implement the local equivalent of inc( v ) and ... same issue, right?

This isn't done in Rust because there's no benefit. It's rare to find an occasion where it's necessary to do something tricky enough to forego using iterators, and when working with raw pointers Rust code just plain doesn't use basic addition for pointer arithmetic; instead it has a variety of pointer arithmetic methods for being explicit about the desired semantics (e.g. ptr::add, ptr::offset, ptr::wrapping_add, etc).

> Plus with rust macros is there any technical reason you can't trivially implement ++ for yourself?

There's not, but people might look at you sideways. Here, I implemented it for you: https://play.rust-lang.org/?version=stable&mode=debug&editio... . It expands to nested blocks with internal assignments, which results in a well-defined semantics following the defined order of evaluation in Rust.