Could someone take a look at DIP PR 109?

[Per Nordlöw]

On Wednesday, 28 March 2018 at 06:43:15 UTC, Shachar Shemesh 
wrote:
> https://github.com/dlang/DIPs/pull/109
>
> I submitted it 12 days ago. So far, except for two thumbs up, I 
> got no official reaction of any kind for it.
>
> I did get an unofficial list of suggestions from Andrei, which 
> I have now incorporated into the DIP, but I was under the 
> impression that I was supposed to either get rejects or a DIP 
> number after a week. That has not happened so far.
>
> For those too lazy to click on the link, the DIP is about 
> adding ability to hook the implicit move D does with structs in 
> order to update references (internal and/or external).
>
> Shachar

Good idea!

I've experimented with run-time variants [1] of Rust-style 
borrow-checking to detect range-invalidation in my containers but 
they can't handle moves because they don't use reference-counted 
storage. Having `opMove` will make it possible to forbid (via an 
`assert`) ranges from being invalidated when their associated 
container is about to moved so this is really a very good idea!

Alternatively the borrow-checking logic could be built into a 
reference-counted storage wrapper without the need for the 
potential use of `opMove` at the cost extra memory indirections.

[1] 
https://github.com/nordlow/phobos-next/blob/f64b94761325b68a52c361ffe36c95fc77c582c7/src/open_hashmap_or_hashset.d#L1308