How to make a global immutable associative array?

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On Wednesday, 19 March 2014 at 01:56:35 UTC, Rikki Cattermole 
wrote:
> Is an enum not appropriate? Because it can be used to push 
> constants and available at ctfe.
>
> enum int[int] aa = [1: 2, 3: 4];
> pragma(msg, aa);

This will create a new associative array at runtime wherever aa 
is used, rather than creating only one instance at compile time 
and referring to it wherever aa is used. This is also the case 
with normal arrays, and possibly objects... I can't remember.