I’m using D to crunch some data, it would be nice for me to be able to have an immutable map of maps that hold direction coordinates. I tried to do this via:

enum Direction
{
    NORTH = "north",
    SOUTH = "south"
}

immutable Direction[int][int] COORD_LOOKUP = [
    3: [2: Direction.NORTH], 1: [3: Direction.SOUTH]
];

However ldc fails with the following:

Error: not an associative array initializer

How can I create this associative array?