DIP69 - Implement scope for escape proof references

[Kagamin via Digitalmars-d]

On Thursday, 4 December 2014 at 09:25:11 UTC, Walter Bright wrote:
> http://wiki.dlang.org/DIP69

How inout fits the picture? It has some scope semantics too.
Section about expressions suggests you will tack scoping 
carefully, but then why would you need return by ref tricks, 
which don't rely on scope tracking and hence look hackable?