C `restrict` keyword in D

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On Monday, 4 September 2017 at 04:10:44 UTC, Moritz Maxeiner 
wrote:
> What I meant (and apparently poorly expressed) is that you can 
> turn a pointer into a reference (as long as it's not null) and 
> taking the address of a "ref" yields a pointer and as in my 
> `foo` example in the above, which path is taken can change at 
> runtime. You can, e.g. generate a reference to an object's 
> member without the compiler being able to detect it by 
> calculating the appropriate pointer and then dereferencing it.

I think I understand now. Thanks!