array of constants?

[Lloyd Dupont]

I'm trying to define an array of constant like:

===
immutable string[int] MyDict = [
    1: "monday",
    2: "tuesday",
    ];

====
And I keep having compiler error:

Error    1    Error: non-constant expression [1:"monday",2:"tuesday"] 
C:\Dev\DTest\DTest1\Dexperiment\LCIDs.d    9

what can I do? how do I do that?