DIP69 - Implement scope for escape proof references

[Nick Treleaven via Digitalmars-d]

On 04/12/2014 21:23, H. S. Teoh via Digitalmars-d wrote:
> 	@property scope ref T borrow() { return t; }
> 	alias borrow this;

While this DIP enabling the above to be memory-safe is awesome, a later 
tweak to AliasThis grammar to allow storage classes could make 'borrow' 
redundant. Plain alias now allows storage classes:

AliasDeclaration:
     alias StorageClassesopt BasicType Declarator ;

So:

TweakedAliasThis:
     alias StorageClassesopt Identifier this ;

Given ref and now scope will be storage classes, that would then allow just:

alias scope ref t this;