Pure delegate not quite pure?

[Tofu Ninja via Digitalmars-d-learn]

On Tuesday, 30 June 2015 at 22:05:43 UTC, Steven Schveighoffer 
wrote:
> Have you tried placing const on the function signature? i.e.:
>
> pure int delegate() const d = () const {...
>
> That's how you'd do it (I think, didn't test) if the delegate 
> context pointer was a class/struct.
>
> -Steve

Nah, says its only available for non-static member functions.